问题 解答题
简算
2.25×
3
5
+1.75×
3
5
+0.6
2.5×(1.9+1.9+1.9+1.9)
答案

(1)2.25×

3
5
+1.75×
3
5
+0.6,

=2.25×

3
5
+1.75×
3
5
+1×
3
5

=(2.25+1.75+1)×

3
5

=5×

3
5

=3;

(2)2.5×(1.9+1.9+1.9+1.9),

=2.5×1.9×4,

=(2.5×4)×1.9,

=10×1.9,

=19.

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