(5x-1200)/(4x-1000)=13/10

问题描述:

(5x-1200)/(4x-1000)=13/10

了吧乘10(4x-1000)
10(5x-1200)=13(4x-1000)
50x-12000=52x-13000
52x-50x=13000-12000
2x=1000
x=1000÷2
x=500

500

(5x-1200)*10=(4x-1000)*13
50x-12000=52x-13000
2x=1000
x=500