精英家教网 > 小学数学 > 题目详情
1
4
+
1
5
=
7
12
×
4
5
=
3
7
÷
3
7
×3=
4.6+
3
5
=
8.7-6.52= 125×32×25= 132.735.27= 7.3÷0.01=
分析:①通分计算;②约分计算;③把除法改为乘法,约分计算;④把分数化为小数再计算;⑤⑦小数点对齐;⑥把32看作8×4,运用乘法结合律简算;⑧把被除数和除数分别扩大100倍.
解答:解:
1
4
+
1
5
=
9
20
;         
7
12
×
4
5
=
7
15
;             3×
3
7
÷
3
7
×3=9;           4.6+
3
5
=5.2;
8.7-6.52=2.18;         125×32×25=100000;     132.73+5.27=138;          7.3÷0.01=730.
点评:此题考查了通分、约分、运算顺序、运算定律等知识.
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