题目内容

简便方法计算.
(
3
7
+
3
28
)×7
3
5
×63%+
7
5
×63%
5.2×
1
4
+1.8×0.25
(1)(
3
7
+
3
28
)×7

=
3
7
×7+
3
28
×7
=3+
3
4

=3
3
4


(2)
3
5
×63%+
7
5
×63%

=(
3
5
+
7
5
)×63%
=2×0.63
=1.26;

(3)5.2×
1
4
+1.8×0.25

=(5.2+1.8)×0.25
=7×0.25
=1.75.
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