3/4x-3/5x=9 6x+2.4=11.4 2/5x除以6/7=7/10(解方程)

问题描述:

3/4x-3/5x=9 6x+2.4=11.4 2/5x除以6/7=7/10(解方程)
快啊,快啊

3/4x-3/5x=9
3*5-3*4=9*20x
x=1/60
6x+2.4=11.4
6x=9
x=3/2
2/5x除以6/7=7/10
(2/5x) *(7/6)=7/10
7x/15=7/10
x=3/2