题目内容
怎样简便就怎样计算.
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(15+
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(
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分析:(1)把除法变为乘法,约分计算;
(2)(3)先算括号内的,再算括号外的;
(4)运用除法的性质简算;
(5)把除法变为乘法,运用乘法分配律简算;
(6)把除法变为乘法,运用乘法交换律与结合律简算.
(2)(3)先算括号内的,再算括号外的;
(4)运用除法的性质简算;
(5)把除法变为乘法,运用乘法分配律简算;
(6)把除法变为乘法,运用乘法交换律与结合律简算.
解答:解:(1)
×
÷
=
×
×
=
(2)
÷(
÷
)
=
÷(
×
)
=
÷
=
×
=
(3)
×(
-
)
=
×
=
(4)(15+
)÷15
=15÷15+
÷15
=1+
=1
(5)(
+
-
)÷
=(
+
-
)×36
=
×36+
×36-
×36
=27+8-30
=5
(6)
÷
×
÷
=
×
×
×
=(
×
)×(
×
)
=1×1
=1
| 5 |
| 6 |
| 2 |
| 15 |
| 8 |
| 3 |
=
| 5 |
| 6 |
| 2 |
| 15 |
| 3 |
| 8 |
=
| 1 |
| 24 |
(2)
| 5 |
| 6 |
| 9 |
| 14 |
| 3 |
| 7 |
=
| 5 |
| 6 |
| 9 |
| 14 |
| 7 |
| 3 |
=
| 5 |
| 6 |
| 3 |
| 2 |
=
| 5 |
| 6 |
| 2 |
| 3 |
=
| 5 |
| 9 |
(3)
| 3 |
| 4 |
| 3 |
| 2 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 5 |
| 6 |
=
| 5 |
| 8 |
(4)(15+
| 15 |
| 37 |
=15÷15+
| 15 |
| 37 |
=1+
| 1 |
| 37 |
=1
| 1 |
| 37 |
(5)(
| 3 |
| 4 |
| 2 |
| 9 |
| 5 |
| 6 |
| 1 |
| 36 |
=(
| 3 |
| 4 |
| 2 |
| 9 |
| 5 |
| 6 |
=
| 3 |
| 4 |
| 2 |
| 9 |
| 5 |
| 6 |
=27+8-30
=5
(6)
| 3 |
| 8 |
| 7 |
| 16 |
| 7 |
| 16 |
| 3 |
| 8 |
=
| 3 |
| 8 |
| 16 |
| 7 |
| 7 |
| 16 |
| 8 |
| 3 |
=(
| 3 |
| 8 |
| 8 |
| 3 |
| 16 |
| 7 |
| 7 |
| 16 |
=1×1
=1
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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