题目内容
| 计算: (1)51÷
|
(2)
| ||||||
(3)
|
(4)99
|
分析:(1)(2)(3)把除法改为乘法,约分计算;
(4)把带分数拆成“整数+分数”的形式,运用除法的运算性质简算.
(4)把带分数拆成“整数+分数”的形式,运用除法的运算性质简算.
解答:解:(1)51÷
=51×
=57;
(2)
÷
=
×
=
;
(3)
÷
=
×
=
;
(4)99
÷3
=(99+
)÷3
=99÷3+
÷3
=33+
×
=33+
=33
.
| 17 |
| 19 |
=51×
| 19 |
| 17 |
=57;
(2)
| 2 |
| 3 |
| 4 |
| 15 |
=
| 2 |
| 3 |
| 15 |
| 4 |
=
| 5 |
| 2 |
(3)
| 18 |
| 169 |
| 3 |
| 26 |
=
| 18 |
| 169 |
| 26 |
| 3 |
=
| 12 |
| 13 |
(4)99
| 7 |
| 8 |
=(99+
| 7 |
| 8 |
=99÷3+
| 7 |
| 8 |
=33+
| 7 |
| 8 |
| 1 |
| 3 |
=33+
| 7 |
| 24 |
=33
| 7 |
| 24 |
点评:此题考查了分数的除法计算,根据题目特点,通过转化的数学思想,灵活解答.
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