Question

解方程：x/0.5-1/0.7=1； y/5-(y-1)/2=1-(y+2)/5

Answer 1

x/0.5-1/0.7=1；

0.7x-0.5=0.35

0.7x=0.85

x=85/70

x=17/14

y/5-(y-1)/2=1-(y+2)/5

2y-5(y-1)=10-2(y+2)

2y-5y+5=10-2y-4

-3y+2y=6-5

-y=1

y=-1