2
7
+
2
7
+
2
7
+
2
7
=
2
7
2
7
×
4
4
分析:乘法的意義為:求幾個(gè)相同加數(shù)和的簡(jiǎn)便計(jì)算.所以
2
7
+
2
7
+
2
7
+
2
7
=
2
7
×4.
解答:解:
2
7
+
2
7
+
2
7
+
2
7
=
2
7
×4.
故答案為:
2
7
,4.
點(diǎn)評(píng):完成本題要注意,分?jǐn)?shù)乘整數(shù)與整數(shù)乘分?jǐn)?shù)的意義是不同的.
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