(1-X/120)=2(1-X/60)怎么解
问题描述:
(1-X/120)=2(1-X/60)怎么解
答
(1-X/120)=2(1-X/60)
(1-X)/120=(1-X)/30
30-30X=120-120X
90X=90
X=1
答
(1-X/120)=2(1-X/60)
1-x/120=2-x/30…………两边乘以120
120-x=240-4x
3x=120
x=40