4x+2乘以(20-x)等于62

问题描述:

4x+2乘以(20-x)等于62

x=1,x=-13/2

4x+40-2x=62
2x=22
x=11

4x+2乘以(20-x)等于62
4x+40-2x=62
2x+40=62
2x=62-40
2x=22
x=11