问题 解答题
解方程.
x+
2
5
x=42

②1.3:x=0.26:0.32.
答案

(1)x+

2
5
x=42,

7
5
x=42,

7
5
5
7
=42×
5
7

x=30,

(2)1.3:x=0.26:0.32.

0.26x=1.3×0.32,

0.26x÷0.26=0.416÷0.26,

x=1.6.

单项选择题
单项选择题