题目内容
用递等式计算
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(2)(3)(5)把除法变为乘法,约分计算.
(4)运用乘法交换律与结合律简算.
(6)先算括号内的,再算括号外的.
(4)运用乘法交换律与结合律简算.
(6)先算括号内的,再算括号外的.
解答:
解:(1)
×
÷
=
×
×
=
(2)
÷
÷2
=
×
×
=
(3)
÷
÷
=
×
×
=
(4)
×6×
=(
×
)×6
=
×6
=2
(5)
÷
×
=
×
×
=
(6)
×(
÷
)
=
×(
×
)
=
×
=
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 7 |
=
| 1 |
| 6 |
| 2 |
| 3 |
| 7 |
| 4 |
=
| 7 |
| 36 |
(2)
| 2 |
| 3 |
| 10 |
| 33 |
=
| 2 |
| 3 |
| 33 |
| 10 |
| 1 |
| 2 |
=
| 11 |
| 10 |
(3)
| 5 |
| 6 |
| 5 |
| 3 |
| 7 |
| 8 |
=
| 5 |
| 6 |
| 3 |
| 5 |
| 8 |
| 7 |
=
| 4 |
| 7 |
(4)
| 4 |
| 9 |
| 3 |
| 4 |
=(
| 4 |
| 9 |
| 3 |
| 4 |
=
| 1 |
| 3 |
=2
(5)
| 12 |
| 13 |
| 2 |
| 11 |
| 2 |
| 5 |
=
| 12 |
| 13 |
| 11 |
| 2 |
| 2 |
| 5 |
=
| 132 |
| 65 |
(6)
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 7 |
=
| 1 |
| 6 |
| 2 |
| 3 |
| 7 |
| 4 |
=
| 1 |
| 6 |
| 7 |
| 6 |
=
| 7 |
| 36 |
点评:此题考查了分数的四则混合运算,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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