x-0.85x=1.38
0.15×=1.38
×=1.38÷0.15
×=9.2
希望能够帮到你
解:解方程,此方程的解为x = 46/5,【即x = 9.2】
x减0.85x等于1.38
x - 0.85x = 1.38
x - (85/100 )x = (1×100+38)/100
x - (17/20)x = 138/100
(20/20)x - (17/20)x = 69/50
(3/20)x = 69/50
x = 69/50 ÷ 3/20
x = 69/50 × 20/3
x = 46/5
∴x = 9.2
答:此方程的解为x = 46/5,【即x = 9.2】