题目内容
用你喜欢的方法计算.
(
+
)×7×5
×
+
×
-
13.6-(2.6+0.25÷25%)
1200÷〔56×(
-
)
(
| 2 |
| 7 |
| 1 |
| 5 |
| 3 |
| 13 |
| 4 |
| 5 |
| 10 |
| 13 |
| 4 |
| 5 |
| 4 |
| 5 |
13.6-(2.6+0.25÷25%)
1200÷〔56×(
| 3 |
| 7 |
| 3 |
| 8 |
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:①②运用乘法的分配律进行计算即可.
③④按照四则混合运算的剩下进行计算即可.
③④按照四则混合运算的剩下进行计算即可.
解答:
解:①(
+
)×7×5
=
×7×5+
×7×5
=10+7
=17
②
×
+
×
-
=(
+
-1)×
=0×
=0
③13.6-(2.6+0.25÷25%)
=13.6-(2.6+1)
=13.6-3.6
=10
④1200÷[56×(
-
)]
=1200÷[56×
-56×
]
=1200÷[24-21]
=1200÷3
=400
| 2 |
| 7 |
| 1 |
| 5 |
=
| 2 |
| 7 |
| 1 |
| 5 |
=10+7
=17
②
| 3 |
| 13 |
| 4 |
| 5 |
| 10 |
| 13 |
| 4 |
| 5 |
| 4 |
| 5 |
=(
| 3 |
| 13 |
| 10 |
| 13 |
| 4 |
| 5 |
=0×
| 4 |
| 5 |
=0
③13.6-(2.6+0.25÷25%)
=13.6-(2.6+1)
=13.6-3.6
=10
④1200÷[56×(
| 3 |
| 7 |
| 3 |
| 8 |
=1200÷[56×
| 3 |
| 7 |
| 3 |
| 8 |
=1200÷[24-21]
=1200÷3
=400
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律简便计算.
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