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
答
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