题目内容
| 怎样简便就怎样计算 (
|
| ||||||||||||||
| (37×40%+40%×63)÷
| ||||||||||||||
(84+24×
|
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:①(
+
-
)×12,运用乘法分配律简算;
②
÷[(
+
)×
],先算先括号里面的加法,再算中括号里面的乘法,最后算除法;
③
×
-
÷
,把除数转化为乘它的倒数,再运用乘法分配律简算;
④(37×40%+40%×63)÷
,运用乘法分配律简算;
⑤(84+24×
)÷80%,先算括号里面的乘法,再算括号里面的加法,最后算除法.
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
②
| 17 |
| 5 |
| 3 |
| 4 |
| 2 |
| 3 |
| 3 |
| 5 |
③
| 6 |
| 7 |
| 16 |
| 9 |
| 2 |
| 9 |
| 7 |
| 6 |
④(37×40%+40%×63)÷
| 2 |
| 5 |
⑤(84+24×
| 2 |
| 3 |
解答:
解:①(
+
-
)×12
=
×12+
×12-
×12
=4+3-2
=5;
②
÷[(
+
)×
]
=
÷[
×
]
=
÷
=
×
=4;
③
×
-
÷
=
×(
-
)
=
×
=1
;
④(37×40%+40%×63)÷
=(37+63)×0.4÷0.4
=100×0.4÷0.4
=100;
⑤(84+24×
)÷80%
=(84+16)÷0.8
=100÷0.8
=125.
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
=
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
=4+3-2
=5;
②
| 17 |
| 5 |
| 3 |
| 4 |
| 2 |
| 3 |
| 3 |
| 5 |
=
| 17 |
| 5 |
| 17 |
| 12 |
| 3 |
| 5 |
=
| 17 |
| 5 |
| 17 |
| 20 |
=
| 17 |
| 5 |
| 20 |
| 17 |
=4;
③
| 6 |
| 7 |
| 16 |
| 9 |
| 2 |
| 9 |
| 7 |
| 6 |
=
| 6 |
| 7 |
| 16 |
| 9 |
| 2 |
| 9 |
=
| 6 |
| 7 |
| 14 |
| 9 |
=1
| 1 |
| 3 |
④(37×40%+40%×63)÷
| 2 |
| 5 |
=(37+63)×0.4÷0.4
=100×0.4÷0.4
=100;
⑤(84+24×
| 2 |
| 3 |
=(84+16)÷0.8
=100÷0.8
=125.
点评:此题考查的目的是理解掌握整数、小数、分数、百分数四则混合运算的顺序以及它们的计算法则,并且能够灵活选择简便方法进行计算.
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