题目内容
脱式计算
|
9÷
|
|
|
分析:①②③根据四则混合运算的运算顺序计算即可.④后再据乘法交换律及结合律计算;
解答:解:①
×
÷
,
=
×
×
,
=1
;
②9÷
÷
,
=9×
×
,
=
,
=5
;
③
÷
×
,
=
×
×
,
=
;
④
×
×
,
=
×(
×
),
=
×6,
=
.
5 |
6 |
14 |
3 |
28 |
9 |
=
5 |
6 |
14 |
3 |
9 |
28 |
=1
1 |
4 |
②9÷
15 |
8 |
5 |
6 |
=9×
8 |
15 |
6 |
5 |
=
144 |
25 |
=5
19 |
25 |
③
4 |
7 |
6 |
5 |
7 |
15 |
=
4 |
7 |
5 |
6 |
7 |
15 |
=
2 |
9 |
④
27 |
4 |
10 |
9 |
27 |
5 |
=
27 |
4 |
10 |
9 |
27 |
5 |
=
27 |
4 |
=
81 |
2 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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