题目内容

简便计算.
7
4
+
3
7
+
1
4

1.25×8.8
2.5×37+6.3×25.
(1)
7
4
+
3
7
+
1
4

=(
7
4
+
1
4
)+
3
7

=2+
3
7

=2
3
7


(2)1.25×8.8,
=1.25×(8+0.8),
=1.25×8+1.25×0.8,
=10+1,
=11;

(3)2.5×37+6.3×25,
=2.5×37+63×2.5,
=(37+63)×2.5,
=100×2.5,
=250.
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