標題:
F.1數學 20點急急急急急要的!!
發問:
F.1數學 20點急急急急急要的!!12) Find x : y : z for each of the following .12a) x : y = 2 : 1 , y : z = 1: 1012b) x : y = 1 : 2 , y : z = 2 : 512c) x : y = 9 : 4 , y : z = 4 : 314a) a / b = 1 , b / c = 1 / 214b) a / b = 1 / 2 , b = 3c14c) 4a = 5b = 2c15) There are 45 gold coins , 60 silver coins and 90... 顯示更多 F.1數學 20點急急急急急要的!! 12) Find x : y : z for each of the following . 12a) x : y = 2 : 1 , y : z = 1: 10 12b) x : y = 1 : 2 , y : z = 2 : 5 12c) x : y = 9 : 4 , y : z = 4 : 3 14a) a / b = 1 , b / c = 1 / 2 14b) a / b = 1 / 2 , b = 3c 14c) 4a = 5b = 2c 15) There are 45 gold coins , 60 silver coins and 90 copper coins in a bag . Find the ratio of the number of gold coins , silver coins and copper coins in the bag . 16) Cindy has 6 English books , 10 Chinese books and 2 Japanese books . 16a) Find the ratio of the number of English books , Chinese books and Japanese books . 16b) If Cindy buys 2 English books , 2 Chinese books and 4 Japanese books , find the ratio of the number of English books , Chinese books and Japanese books owned by Cindy now .
最佳解答:
F.1數學 20點急急急急急要的!! 12) Find x : y : z for each of the following . 12a) x : y = 2 : 1 , y : z = 1: 10 A. x:y = 2:1 y:z = 1:10 x:y:z = 2*1 : 1*1 : 1*10 x:y:z = 2:1:10 12b) x : y = 1 : 2 , y : z = 2 : 5 A. x:y = 1:2 y:z = 2:5 x:y:z = 1*2 : 2*2 : 2*5 x:y:z = 2:4:10 x:y:z = 1:2:5 12c) x : y = 9 : 4 , y : z = 4 : 3 A. x:y = 9:4 y:z = 4:3 x:y:z = 9*4 : 4*4 : 3*4 x:y:z = 36:16:12 x:y:z = 9:4:3 14a) a / b = 1 , b / c = 1 / 2 A. a/b = 1 a:b = 1:1 b/c = 1/2 b:c = 1:2 a:b:c = 1*1 : 1*1 : 2*2 a:b:c = 1:1:2 14b) a / b = 1 / 2 , b = 3c A. a/b = 1/2 a:b = 1:2 b = 3c b/c = 3/1 b:c = 3:1 a:b:c = 1*3 : 2*3 : 2*1 a:b:c = 3:6:2 14c) 4a = 5b = 2c A. 4a = 5b a/b = 5/4 a:b = 5:4 5b = 2c b/c = 2/5 b:c = 2:5 a:b:c = 5*2 : 4*2 : 4*5 a:b:c = 10:8:20 a:b:c = 5:4:10 15) There are 45 gold coins , 60 silver coins and 90 copper coins in a bag . Find the ratio of the number of gold coins , silver coins and copper coins in the bag . A. the ratio of the number of gold coins , silver coins and copper coins in the bag = 45:60:90 = 45/15 : 60/15 : 90/15 = 3:4:6 16) Cindy has 6 English books , 10 Chinese books and 2 Japanese books . 16a) Find the ratio of the number of English books , Chinese books and Japanese books . A. the ratio of the number of English books , Chinese books and Japanese books = 6:10:2 = 6/2 : 10/2 : 2/2 = 3:5:1 16b) If Cindy buys 2 English books , 2 Chinese books and 4 Japanese books , find the ratio of the number of English books , Chinese books and Japanese books owned by Cindy now . A. the ratio of the number of English books , Chinese books and Japanese books owned by Cindy now = (6+2):(10+2):(2+4) = 8:12:6 = 8/2 : 12/2 : 6/2 = 4:6:3 2010-05-09 19:30:53 補充： To 003: There is a quicker method for 16a) and 16b).
其他解答:
12a) x : y = 2 : 1 , y : z = 1: 10 x:y =2:1 y:z= 1:10 x:y:z=2:1:10 12b) x : y = 1 : 2 , y : z = 2 : 5 x:y =1:2 y:z= 2:5 x:y:x=1:2:5 12c) x : y = 9 : 4 , y : z = 4 : 3 x:y =9:4 y:z = 4:3 x:y:z =9:4:3 14a) a / b = 1 , b / c = 1 / 2 a:b =1:1 b:c = 1:2 a:b:c = 1:1:2 14b) a / b = 1 / 2 , b = 3c b/c=3 a:b =1:2 b:c= 3:1 a:b:c=3:6:2 14c) 4a = 5b = 2c a/b=5/4 b/c=2/5 a:b =5:4 b:c= 2:5 a:b:c=5:4:10 15)The ratio. =45 :60 : 90 = 7 :12 : 18 16a)The ratio. =6:10:2 =3: 5 :1 16b)The ratio. =8:12:6 =4:6 :3|||||12) a) x : y : =2 : 1 y : z = 1 : 10 x : y : z =2 : 1 : 10 b) x : y : =1 : 2 y : z = 2 : 5 x : y : z =1 : 2 : 5 c) x : y : =9 : 4 y : z = 4 : 3 x : y : z =9 : 4 : 3 14) a) a/b=1,a:b=1:1 b/c=1/2,b:c=1:2 a : b : =1 : 1 b : c = 1 : 2 a : b : c =1 : 1 : 2 b) a/b=1/2,a:b=1:2 b=3c,b/c=3,b:c=3:1 a : b : =1 : 2 b : c = 3 :1 a : b : c =3 : 6 : 2 c)4a=5b=2c 1: 4a=5b,a/b=5/4,a:b=5:4 2: 5b=2c,b/c=2/5,b:c=2:5 a : b : =5 : 4 b : c = 2 : 5 a : b : c =5 : 4 : 10 15)Let 45x(gold coins),60y(silver coins),90z(copper coins) 1: x:y=45:60 = 3:4 2: y:z=60:90 = 2:3 x : y : =3 :4 y : z = 2 : 3 x : y : z =3 : 4 : 6 16)Let 6x(English books),10y(Chinese books),2z(Japanese books) a) 1:x:y=6:10 =3:5 2:y:z=10:2 = 5:1 x : y : =3 : 5 y : z = 5 : 1 x : y : z =3 : 5 : 1 b)Let 8x(English books),12y(Chinese books),6z(Japanese books) 1:x:y=8:12 =2:3 2:y:z=12:6 = 2:1 x : y : =2 : 3 y : z = 2 : 1 x : y : z =4 : 6 : 3|||||very easy very easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easy
F.1數學 20點急急急急急要的!!
發問:
F.1數學 20點急急急急急要的!!12) Find x : y : z for each of the following .12a) x : y = 2 : 1 , y : z = 1: 1012b) x : y = 1 : 2 , y : z = 2 : 512c) x : y = 9 : 4 , y : z = 4 : 314a) a / b = 1 , b / c = 1 / 214b) a / b = 1 / 2 , b = 3c14c) 4a = 5b = 2c15) There are 45 gold coins , 60 silver coins and 90... 顯示更多 F.1數學 20點急急急急急要的!! 12) Find x : y : z for each of the following . 12a) x : y = 2 : 1 , y : z = 1: 10 12b) x : y = 1 : 2 , y : z = 2 : 5 12c) x : y = 9 : 4 , y : z = 4 : 3 14a) a / b = 1 , b / c = 1 / 2 14b) a / b = 1 / 2 , b = 3c 14c) 4a = 5b = 2c 15) There are 45 gold coins , 60 silver coins and 90 copper coins in a bag . Find the ratio of the number of gold coins , silver coins and copper coins in the bag . 16) Cindy has 6 English books , 10 Chinese books and 2 Japanese books . 16a) Find the ratio of the number of English books , Chinese books and Japanese books . 16b) If Cindy buys 2 English books , 2 Chinese books and 4 Japanese books , find the ratio of the number of English books , Chinese books and Japanese books owned by Cindy now .
最佳解答:
F.1數學 20點急急急急急要的!! 12) Find x : y : z for each of the following . 12a) x : y = 2 : 1 , y : z = 1: 10 A. x:y = 2:1 y:z = 1:10 x:y:z = 2*1 : 1*1 : 1*10 x:y:z = 2:1:10 12b) x : y = 1 : 2 , y : z = 2 : 5 A. x:y = 1:2 y:z = 2:5 x:y:z = 1*2 : 2*2 : 2*5 x:y:z = 2:4:10 x:y:z = 1:2:5 12c) x : y = 9 : 4 , y : z = 4 : 3 A. x:y = 9:4 y:z = 4:3 x:y:z = 9*4 : 4*4 : 3*4 x:y:z = 36:16:12 x:y:z = 9:4:3 14a) a / b = 1 , b / c = 1 / 2 A. a/b = 1 a:b = 1:1 b/c = 1/2 b:c = 1:2 a:b:c = 1*1 : 1*1 : 2*2 a:b:c = 1:1:2 14b) a / b = 1 / 2 , b = 3c A. a/b = 1/2 a:b = 1:2 b = 3c b/c = 3/1 b:c = 3:1 a:b:c = 1*3 : 2*3 : 2*1 a:b:c = 3:6:2 14c) 4a = 5b = 2c A. 4a = 5b a/b = 5/4 a:b = 5:4 5b = 2c b/c = 2/5 b:c = 2:5 a:b:c = 5*2 : 4*2 : 4*5 a:b:c = 10:8:20 a:b:c = 5:4:10 15) There are 45 gold coins , 60 silver coins and 90 copper coins in a bag . Find the ratio of the number of gold coins , silver coins and copper coins in the bag . A. the ratio of the number of gold coins , silver coins and copper coins in the bag = 45:60:90 = 45/15 : 60/15 : 90/15 = 3:4:6 16) Cindy has 6 English books , 10 Chinese books and 2 Japanese books . 16a) Find the ratio of the number of English books , Chinese books and Japanese books . A. the ratio of the number of English books , Chinese books and Japanese books = 6:10:2 = 6/2 : 10/2 : 2/2 = 3:5:1 16b) If Cindy buys 2 English books , 2 Chinese books and 4 Japanese books , find the ratio of the number of English books , Chinese books and Japanese books owned by Cindy now . A. the ratio of the number of English books , Chinese books and Japanese books owned by Cindy now = (6+2):(10+2):(2+4) = 8:12:6 = 8/2 : 12/2 : 6/2 = 4:6:3 2010-05-09 19:30:53 補充： To 003: There is a quicker method for 16a) and 16b).
其他解答:
12a) x : y = 2 : 1 , y : z = 1: 10 x:y =2:1 y:z= 1:10 x:y:z=2:1:10 12b) x : y = 1 : 2 , y : z = 2 : 5 x:y =1:2 y:z= 2:5 x:y:x=1:2:5 12c) x : y = 9 : 4 , y : z = 4 : 3 x:y =9:4 y:z = 4:3 x:y:z =9:4:3 14a) a / b = 1 , b / c = 1 / 2 a:b =1:1 b:c = 1:2 a:b:c = 1:1:2 14b) a / b = 1 / 2 , b = 3c b/c=3 a:b =1:2 b:c= 3:1 a:b:c=3:6:2 14c) 4a = 5b = 2c a/b=5/4 b/c=2/5 a:b =5:4 b:c= 2:5 a:b:c=5:4:10 15)The ratio. =45 :60 : 90 = 7 :12 : 18 16a)The ratio. =6:10:2 =3: 5 :1 16b)The ratio. =8:12:6 =4:6 :3|||||12) a) x : y : =2 : 1 y : z = 1 : 10 x : y : z =2 : 1 : 10 b) x : y : =1 : 2 y : z = 2 : 5 x : y : z =1 : 2 : 5 c) x : y : =9 : 4 y : z = 4 : 3 x : y : z =9 : 4 : 3 14) a) a/b=1,a:b=1:1 b/c=1/2,b:c=1:2 a : b : =1 : 1 b : c = 1 : 2 a : b : c =1 : 1 : 2 b) a/b=1/2,a:b=1:2 b=3c,b/c=3,b:c=3:1 a : b : =1 : 2 b : c = 3 :1 a : b : c =3 : 6 : 2 c)4a=5b=2c 1: 4a=5b,a/b=5/4,a:b=5:4 2: 5b=2c,b/c=2/5,b:c=2:5 a : b : =5 : 4 b : c = 2 : 5 a : b : c =5 : 4 : 10 15)Let 45x(gold coins),60y(silver coins),90z(copper coins) 1: x:y=45:60 = 3:4 2: y:z=60:90 = 2:3 x : y : =3 :4 y : z = 2 : 3 x : y : z =3 : 4 : 6 16)Let 6x(English books),10y(Chinese books),2z(Japanese books) a) 1:x:y=6:10 =3:5 2:y:z=10:2 = 5:1 x : y : =3 : 5 y : z = 5 : 1 x : y : z =3 : 5 : 1 b)Let 8x(English books),12y(Chinese books),6z(Japanese books) 1:x:y=8:12 =2:3 2:y:z=12:6 = 2:1 x : y : =2 : 3 y : z = 2 : 1 x : y : z =4 : 6 : 3|||||very easy very easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easyvery easy
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