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1)there are 32 students in a from 6D. the number of boys is 3 less than 3/4 that ofgirls,(a)find the number of boys.(b)if a boys withdraw such that 1/3 of the class are boys, find the values of a.2)the length of a rectangli is 0.5cm less than 1.5 times the width. if the rectangle is 54cm,(a)find the length... 顯示更多 1)there are 32 students in a from 6D. the number of boys is 3 less than 3/4 that of girls, (a)find the number of boys. (b)if a boys withdraw such that 1/3 of the class are boys, find the values of a. 2)the length of a rectangli is 0.5cm less than 1.5 times the width. if the rectangle is 54cm, (a)find the length and width of the rectangle. (b)find the area of the rectangle..

最佳解答:

1)there are 32 students in a from 6D. the number of boys is 3 less than 3/4 that of girls let girl x (a)3/4x-3+x=32 7/4x-3=32 7/4x=35 x=20 (b) a=(20*3/4-3)/3 a=5 2 2)the length of a rectangli is 0.5cm less than 1.5 times the width. if the ectangle is 54cm, (perimetre?) let the width x 2(x+1.5x-0.5)=54 2.5x-0.5=27 2.5x=27.5 x=11 therefore width=11 length=16 b the area is 11*16=176 2006-12-02 21:39:23 補充： 樓下你好明顯抄我啦張x變成n同埋最後加句hope i can help u知唔知點解我知if the ectangle

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