解方程10x+10(x+3)=670_数学解答

解方程10x+10(x+3)=670

人气：187 ℃　时间：2020-04-12 18:21:51

解答

10x+10(x+3)=670
10x+10x+30=670
20x+30=670
20x+30-30=670-30
20x=640
20x÷20=640÷20
x=32