问题 解答题
解方程
5x-2+1.8=3.67(x-1.2)=2.1.
答案

(1)5x-2+1.8=3.6,

5x-0.2=3.6,

5x-0.2+0.2=3.6+0.2,

5x=3.8,

5x÷5=3.8÷5,

x=0.76;

(2)7(x-1.2)=2.1,

7x-7×1.2=2.1,

7x-8.4=2.1,

7x-8.4+8.4=2.1+8.4,

7x=10.5,

7x÷7=10.5÷7,

x=1.5.

单项选择题
单项选择题