问题 解答题

解方程:

x+3x=12.6;

x÷0.3=6.8;

x-12.5=12.5.

答案

(1)x+3x=12.6,

4x=12.6,

4x÷4=12.6÷4,

x=3.15;

(2)x÷0.3=6.8,

x÷0.3×0.3=6.8×0.3,

x=2.04;

(3)x-12.5=12.5,

x-12.5+12.5=12.5+12.5,

x=25.

单项选择题
单项选择题