题目内容
计算,能简算的要简算.
|
1-
|
48×(
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)把除法变为乘法,运用乘法分配律简算.
(2)先算除法,然后运用减法的性质简算.
(3)运用乘法分配律简算.
(2)先算除法,然后运用减法的性质简算.
(3)运用乘法分配律简算.
解答:
解:(1)
×
-
÷
=
×
-
×
=(
-
)×
=
×
=
(2)1-
÷
-
=1-
×
-
=1-
-
=1-(
+
)
=1-1
=0
(3)48×(
-
+
)
=48×
-48×
+48×
=32-24+36
=44
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=
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| 5 |
| 5 |
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=(
| 4 |
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=
| 1 |
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=
| 1 |
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(2)1-
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| 8 |
| 25 |
| 28 |
| 3 |
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=1-
| 5 |
| 8 |
| 28 |
| 25 |
| 3 |
| 10 |
=1-
| 7 |
| 10 |
| 3 |
| 10 |
=1-(
| 7 |
| 10 |
| 3 |
| 10 |
=1-1
=0
(3)48×(
| 2 |
| 3 |
| 1 |
| 2 |
| 3 |
| 4 |
=48×
| 2 |
| 3 |
| 1 |
| 2 |
| 3 |
| 4 |
=32-24+36
=44
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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