14x—x=169和1.7x+0.5x=4.4解方程并验算快

问题描述:

14x—x=169和1.7x+0.5x=4.4解方程并验算快

14x—x=169
13x=169
x=169÷13
x=13

1.7x+0.5x=4.4
2.2x=4.4
x=4.4÷2.2
x=2验算呢?14x13-13=1691.7x2+0.5x2=4.4