0.4（y一0.2）十1.5二0.7y一0.38这道题如何解方程?

题目

0.4（y一0.2）十1.5二0.7y一0.38这道题如何解方程?

答案

0.4（y一0.2）十1.5=0.7y一0.38
0.4y-0.08+1.5=0.7y-0.38
0.4y+1.42=0.7y-0.38
0.7y-0.4y=1.42+0.38
0.3y=1.8
y=6