Question

0.9×(x+0.4)=0.45解方程

Answer 1

0.9×(x+0.4)=0.45
0.9x+0.36=0.45
0.9x=0.45-0.36
0.9x=0.9
x=1

Answer 2

0.9×(x+0.4)=0.45
解∶ x+0.4=0.45/0.9
x=0.5-0.4
x=0.1

Answer 3

0.9×(x+0.4)=0.45
x+0.4=0.45÷0.9
x+0.4=0.5
x=0.1。