题目内容
递等式计算.
|
|
| ||||||||||||||||||||
12×( 50%+
|
12.5%×56×
|
36×(
|
考点:百分数的加减乘除运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)把百分数化为分数,运用乘法分配律简算.
(2)把除法变为乘法,运用乘法分配律简算.
(3)(4)先算括号内的,再算括号外的.
(5)把百分数化为分数,约分计算.
(6)先算括号内的,然后从左往右依次计算.
(2)把除法变为乘法,运用乘法分配律简算.
(3)(4)先算括号内的,再算括号外的.
(5)把百分数化为分数,约分计算.
(6)先算括号内的,然后从左往右依次计算.
解答:
解:(1)
×75%+
×
=
×
+
×
=(
+
)×
=1×
=
(2)
÷
+
÷
=
×
+
×
=(
+
)×
=1×
=
(3)
÷(
-
)
=
÷
=
×
=
(4)12×(50%+
)
=12×(
+
)
=12×
=15
(5)12.5%×56×
=
×56×
=2
(6)36×(
+
)÷
=36×(
+
)×
=36×
×
=
| 7 |
| 13 |
| 3 |
| 4 |
| 6 |
| 13 |
=
| 7 |
| 13 |
| 3 |
| 4 |
| 3 |
| 4 |
| 6 |
| 13 |
=(
| 7 |
| 13 |
| 6 |
| 13 |
| 3 |
| 4 |
=1×
| 3 |
| 4 |
=
| 3 |
| 4 |
(2)
| 3 |
| 7 |
| 7 |
| 11 |
| 4 |
| 7 |
| 7 |
| 11 |
=
| 3 |
| 7 |
| 11 |
| 7 |
| 4 |
| 7 |
| 11 |
| 7 |
=(
| 3 |
| 7 |
| 4 |
| 7 |
| 11 |
| 7 |
=1×
| 11 |
| 7 |
=
| 11 |
| 7 |
(3)
| 12 |
| 7 |
| 2 |
| 3 |
| 1 |
| 4 |
=
| 12 |
| 7 |
| 5 |
| 12 |
=
| 12 |
| 7 |
| 12 |
| 5 |
=
| 144 |
| 35 |
(4)12×(50%+
| 3 |
| 4 |
=12×(
| 1 |
| 2 |
| 3 |
| 4 |
=12×
| 5 |
| 4 |
=15
(5)12.5%×56×
| 2 |
| 7 |
=
| 1 |
| 8 |
| 2 |
| 7 |
=2
(6)36×(
| 7 |
| 9 |
| 5 |
| 6 |
| 29 |
| 5 |
=36×(
| 7 |
| 9 |
| 5 |
| 6 |
| 5 |
| 29 |
=36×
| 56 |
| 36 |
| 5 |
| 29 |
=
| 280 |
| 29 |
点评:此题考查了分数的四则混合运算的运算顺序和运算法则以及运用运算定律进行简算.
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