3
8
×
4
7
+
4
7
×
13
8
-
4
7
分析:把最后一個
4
7
化成
4
7
×1,再利用乘法分配律簡算.
解答:解:
3
8
×
4
7
+
4
7
×
13
8
-
4
7

=
3
8
×
4
7
+
4
7
×
13
8
-
4
7
×1,
=(
3
8
+
13
8
-1)×
4
7
,
=1×
4
7

=
4
7
點(diǎn)評:乘法分配律是最常用的簡便運(yùn)算的方法,要熟練掌握,靈活運(yùn)用.
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