题目内容
计算,能简算的要简算.
(
|
|
6÷(
| ||||||||||||||||
47×
|
|
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算减法,再算除法;
(2)根据乘法分配律进行简算;
(3)先算加法,再算除法;
(4)根据乘法分配律进行简算;
(5)根据乘法分配律进行简算;
(6)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,再算除法;
(4)根据乘法分配律进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
解答:
解:(1)(
-
)÷
=
÷
=
;
(2)
÷7+
×
=
×
+
×
=(
+
)×
=1×
=
;
(3)6÷(
+
)
=6÷
=
;
(4)47×
=(48-1)×
=48×
-1×
=9-
=8
;
(5)
×11-
×2
=
×(11-2)
=
×9
=6;
(6)
÷9+
×
=
×
+
×
=
×(
+
)
=
×1
=
.
| 3 |
| 4 |
| 1 |
| 8 |
| 5 |
| 12 |
=
| 5 |
| 8 |
| 5 |
| 12 |
=
| 3 |
| 2 |
(2)
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=(
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
(3)6÷(
| 3 |
| 5 |
| 1 |
| 10 |
=6÷
| 7 |
| 10 |
=
| 60 |
| 7 |
(4)47×
| 9 |
| 48 |
=(48-1)×
| 9 |
| 48 |
=48×
| 9 |
| 48 |
| 9 |
| 48 |
=9-
| 9 |
| 48 |
=8
| 13 |
| 16 |
(5)
| 2 |
| 3 |
| 2 |
| 3 |
=
| 2 |
| 3 |
=
| 2 |
| 3 |
=6;
(6)
| 6 |
| 25 |
| 6 |
| 25 |
| 8 |
| 9 |
=
| 6 |
| 25 |
| 1 |
| 9 |
| 6 |
| 25 |
| 8 |
| 9 |
=
| 6 |
| 25 |
| 1 |
| 9 |
| 8 |
| 9 |
=
| 6 |
| 25 |
=
| 6 |
| 25 |
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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