f.1math....急~~
2007-02-27 12:24 am
Machine A can produce(5x+1) toy cars every two hours and machine B can produce(7x+10) toy cars every three hours. If machine A and machine B start operating at the same time,the number of toy cars produced by the two machines are the same after 6 hours.How many toy cars can be produced in total by the two machine after 6 hours?
回答 (3)
2007-02-27 12:35 am
✔ 最佳答案
(5x+1) x 3 = (7x+10) x 215x +3 = 14x +20
15x-14x= 20-3
x=17
then
=(5x17 + 1) x3 + (7x 17 +10) x 2
=258+258
=516.
(516 is the final answer)
2007-02-27 12:35 am
3(5x+10)=2(7x+10)
15x+30=14x+20
15x-14x=20-30
x=-10
15x+30=14x+20
15x-14x=20-30
x=-10
2007-02-27 12:30 am
3(5x+10)=2(7x+10)
15x+30=14x+20
15x-14x=20-30
x= -10
2007-02-26 16:33:56 補充：
Machine A can produce: 3(5*-10+10)=3(-50+10)=3*-40=-120Machine B can produce: 2(7*-10+10)=2(-70+10)=2*-60=-120
15x+30=14x+20
15x-14x=20-30
x= -10
2007-02-26 16:33:56 補充：
Machine A can produce: 3(5*-10+10)=3(-50+10)=3*-40=-120Machine B can produce: 2(7*-10+10)=2(-70+10)=2*-60=-120
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https://hk.answers.yahoo.com/question/index?qid=20070226000051KK02353