题目内容
| 怎样算简便就怎样算 (
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| 29×
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考点:分数的四则混合运算,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)(2)(5)根据乘法分配律计算;
(3)先算小括号里面的减法,再将除法变为乘法约分计算即可求解;
(4)将除法变为乘法约分计算即可求解;
(6)将除法变为乘法,再根据乘法分配律计算计算即可求解.
(3)先算小括号里面的减法,再将除法变为乘法约分计算即可求解;
(4)将除法变为乘法约分计算即可求解;
(6)将除法变为乘法,再根据乘法分配律计算计算即可求解.
解答:
解:(1)(
-
)×60
=
×60-
×60
=35-12
=23
(2)
×
+
×
=(
+
)×
=1×
=
(3)
×(1-
)÷
=
×
×
=
(4)
×
÷
=
×
×
=
(5)29×
=(28+1)×
=28×
+
=5+
=5
(6)
÷7+
×
=
×
+
×
=(
+
)×
=
×
=
| 7 |
| 12 |
| 1 |
| 5 |
=
| 7 |
| 12 |
| 1 |
| 5 |
=35-12
=23
(2)
| 4 |
| 7 |
| 6 |
| 13 |
| 3 |
| 7 |
| 6 |
| 13 |
=(
| 4 |
| 7 |
| 3 |
| 7 |
| 6 |
| 13 |
=1×
| 6 |
| 13 |
=
| 6 |
| 13 |
(3)
| 3 |
| 4 |
| 2 |
| 3 |
| 7 |
| 10 |
=
| 3 |
| 4 |
| 1 |
| 3 |
| 10 |
| 7 |
=
| 5 |
| 14 |
(4)
| 7 |
| 15 |
| 5 |
| 3 |
| 10 |
| 9 |
=
| 7 |
| 15 |
| 5 |
| 3 |
| 9 |
| 10 |
=
| 7 |
| 10 |
(5)29×
| 5 |
| 28 |
=(28+1)×
| 5 |
| 28 |
=28×
| 5 |
| 28 |
| 5 |
| 28 |
=5+
| 5 |
| 28 |
=5
| 5 |
| 28 |
(6)
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=(
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
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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