题目内容
脱式计算我能行.(能简算的一定要简算哟)
|
|
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(
| 3-
| (1÷
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考点:整数、分数、小数、百分数四则混合运算,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)(4)先算括号内的,再算括号外的;
(2)把除法变为乘法,约分计算;
(3)先算除法,再算加法;
(5)运用减法的性质简算;
(6)先算括号内的,然后运用乘法分配律简算.
(2)把除法变为乘法,约分计算;
(3)先算除法,再算加法;
(5)运用减法的性质简算;
(6)先算括号内的,然后运用乘法分配律简算.
解答:
解:(1)
÷(
+
)
=
÷
=
×
=
(2)
÷
÷
=
×
×
=
(3)
÷
+
=
×
+
=
+
=
(4)(
+
)÷
=
×
=
(5)3-
-
=3-(
+
)
=3-1
=2
(6)(1÷
+
÷1)×4
=(4+
)×4
=4×4+
×4
=16+1
=17
| 5 |
| 6 |
| 1 |
| 2 |
| 5 |
| 6 |
=
| 5 |
| 6 |
| 4 |
| 3 |
=
| 5 |
| 6 |
| 3 |
| 4 |
=
| 5 |
| 8 |
(2)
| 3 |
| 4 |
| 7 |
| 8 |
| 15 |
| 14 |
=
| 3 |
| 4 |
| 8 |
| 7 |
| 14 |
| 15 |
=
| 4 |
| 5 |
(3)
| 33 |
| 34 |
| 22 |
| 17 |
| 5 |
| 12 |
=
| 33 |
| 34 |
| 17 |
| 22 |
| 5 |
| 12 |
=
| 3 |
| 4 |
| 5 |
| 12 |
=
| 7 |
| 6 |
(4)(
| 3 |
| 5 |
| 3 |
| 10 |
| 7 |
| 10 |
=
| 9 |
| 10 |
| 10 |
| 7 |
=
| 9 |
| 7 |
(5)3-
| 5 |
| 12 |
| 7 |
| 12 |
=3-(
| 5 |
| 12 |
| 7 |
| 12 |
=3-1
=2
(6)(1÷
| 1 |
| 4 |
| 1 |
| 4 |
=(4+
| 1 |
| 4 |
=4×4+
| 1 |
| 4 |
=16+1
=17
点评: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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