题目内容
计算,能简算的要简算
|
| ||||||||||||||
[1-(
| (
|
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)先算除法,再算加法;
(2)根据乘法分配律进行简算;
(3)先算加法,再算减法,最后算乘法;
(4)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)先算加法,再算减法,最后算乘法;
(4)根据乘法分配律进行简算.
解答:
解:(1)
÷7+7÷
=
+49
=49
;
(2)
×88+
÷
=
×88+
×88
=(
+
)×88
=1×88
=88;
(3)[1-(
+
)]×
=[1-
]×
=
×
=
;
(4)(
+
-
)÷
=(
+
-
)×36
=
×36+
×36-
×36
=18+24-10
=42-10
=32.
| 1 |
| 7 |
| 1 |
| 7 |
=
| 1 |
| 49 |
=49
| 1 |
| 49 |
(2)
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 88 |
=
| 3 |
| 4 |
| 1 |
| 4 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
=1×88
=88;
(3)[1-(
| 3 |
| 4 |
| 1 |
| 12 |
| 3 |
| 2 |
=[1-
| 5 |
| 6 |
| 3 |
| 2 |
=
| 1 |
| 6 |
| 3 |
| 2 |
=
| 1 |
| 4 |
(4)(
| 1 |
| 2 |
| 2 |
| 3 |
| 5 |
| 18 |
| 1 |
| 36 |
=(
| 1 |
| 2 |
| 2 |
| 3 |
| 5 |
| 18 |
=
| 1 |
| 2 |
| 2 |
| 3 |
| 5 |
| 18 |
=18+24-10
=42-10
=32.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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