试题:
解方程.
x+
2
5
x=42

②1.3:x=0.26:0.32.
解方程 2016-05-21

答案:

我来补答
(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.
 
 
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