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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