题目内容
怎样算简便就怎样算
×
÷
36×
+0.75×63+75%
18×(
+
-
)
÷(5-
-
)
| 4 |
| 9 |
| 3 |
| 4 |
| 9 |
| 12 |
36×
| 3 |
| 4 |
18×(
| 2 |
| 9 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 4 |
| 8 |
| 13 |
| 5 |
| 13 |
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)从左到右依次计算;
(2)先把
及75%化为0.75,再利用乘法分配律简算;
(3)利用乘法分配律简算;
(4)先利用减法的性质对小括号里面进行简算,再算括号外的除法.
(2)先把
| 3 |
| 4 |
(3)利用乘法分配律简算;
(4)先利用减法的性质对小括号里面进行简算,再算括号外的除法.
解答:
解:(1)
×
÷
=
÷
=
×
=
;
(2)36×
+0.75×63+75%
=36×0.75+0.75×63+0.75
=(36+63+1)×0.75
=100×0.75
=75;
(3)18×(
+
-
)
=18×
+18×
-18×
=4+6-3
=7;
(4)
÷(5-
-
)
=
÷[5-(
+
)]
=
÷[5-1]
=
÷4
=
.
| 4 |
| 9 |
| 3 |
| 4 |
| 9 |
| 12 |
=
| 1 |
| 3 |
| 9 |
| 12 |
=
| 1 |
| 3 |
| 12 |
| 9 |
=
| 4 |
| 9 |
(2)36×
| 3 |
| 4 |
=36×0.75+0.75×63+0.75
=(36+63+1)×0.75
=100×0.75
=75;
(3)18×(
| 2 |
| 9 |
| 1 |
| 3 |
| 1 |
| 6 |
=18×
| 2 |
| 9 |
| 1 |
| 3 |
| 1 |
| 6 |
=4+6-3
=7;
(4)
| 1 |
| 4 |
| 8 |
| 13 |
| 5 |
| 13 |
=
| 1 |
| 4 |
| 8 |
| 13 |
| 5 |
| 13 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
=
| 1 |
| 16 |
点评:此题主要考查运用整数的运算定律、运算性质对分数四则混合运算进行简便计算,提高计算的速度和做题的正确率.
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