15X-36=48 120-156X=40 1.2乘6+0.8X=120 怎么解
问题描述:
15X-36=48 120-156X=40 1.2乘6+0.8X=120 怎么解
答
15X-36=4815X=48+36 X=84÷15 X=5.6120-156X=40156X=120-40 X=80÷156 X=20/39 1.2乘6+0.8X=1207.2+0.8X=1200.8X=120-7.2 X=112.8÷0...