Question

解方程 1.5=0.72/0.4+0.03x-0.06/0.3 0.36/0.2-0.09x-0.18/0.9=0.05

Answer 1

1.5=0.72/0.4+0.03x-0.06/0.3

先化小数

1.5=9/5+0.03x-1/5

1.5=0.03x+8/5

0.03x=3/2-8/5

3/100*x=15/10-16/10

3/100*x=-1/10

x=-10/3

0.36/0.2-0.09x-0.18/0.9=0.05

9/5-0.09x-1/5=0.05

0.09x=8/5-1/20

9/100*x=31/20

x=155/9