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數學難題,請計一計
發問:
請幫手列式計一計1) A boy standing on the roof of his school building of height 34 metres threw a pebble 12 metres up. Find the distance that the pebble travelled before landing on the playground in front of the building?2) A bus leaves Bangkok and travels east. Simultaneously another bus leaves fromthe... 顯示更多 請幫手列式計一計 1) A boy standing on the roof of his school building of height 34 metres threw a pebble 12 metres up. Find the distance that the pebble travelled before landing on the playground in front of the building? 2) A bus leaves Bangkok and travels east. Simultaneously another bus leaves from the same spot towards west. The distance travelled by the first bus is 30km less than the twice of the distance travelled by the second bus, and the two buses are 336 km apart. Find the distance travelled by each bus.
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1) A boy standing on the roof of his school building of height 34 metres threw a pebble 12 metres up. Find the distance that the pebble travelled before landing on the playground in front of the building? Distance that the pebble travelled before landing on the playground in front of the building = 34 + 12 + 12 = 58 m 2) A bus leaves Bangkok and travels east. Simultaneously another bus leaves from the same spot towards west. The distance travelled by the first bus is 30km less than the twice of the distance travelled by the second bus, and the two buses are 336 km apart. Find the distance travelled by each bus. Let x km be the distance travelled by first bus, i.e. distance travelled by second bus is (336-x)km 2(336-x)-30=x 672-2x-30=x 642=3x x=214 Hence, distance travelled by first bus is 214km, distance travelled by second bus is (336-214)km = 122km
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