X/(X+15-8)-0.2=0.75如何解
问题描述:
X/(X+15-8)-0.2=0.75如何解
答
x-0.2(x+7)=0.75(x+7)
x-0.2x-1.4=0.75x+5.25
0.05x=6.65 x=133
答
X/(X+7)-0.2=0.75
X/(X+7)=0.95
X=0.95(X+7)
X=0.95X+6.65
0.05X=6.65
X=133