解方程7x-3.4x=0.72; 3(x+2.1)=10.5; 3x+3×6.5=31.2.
问题描述:
解方程
7x-3.4x=0.72;
3(x+2.1)=10.5;
3x+3×6.5=31.2.
答
(1)7x-3.4x=0.72 3.6x=0.72 3.6x÷3.6=0.72÷3.6 &nb...