题目内容
怎样算简便就怎么算:
| 4-
|
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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)(6)先算乘除,后算加减;
(2)根据减法的性质简算;
(3)根据乘法的分配律简算;
(5)先算小括号里面的减法,再算外面的除法,最后算中括号外面的减法.
(2)根据减法的性质简算;
(3)根据乘法的分配律简算;
(5)先算小括号里面的减法,再算外面的除法,最后算中括号外面的减法.
解答:
解:(1)
×
-
÷
=1-
=
(2)4-
-
=4-(
+
)
=4-1
=2
(3)
×58+
×41+
=
×(58+41+1)
=
×100
=12.5
(4)
×
+
÷
=
+
=
(5)
-[(
-
)÷
]
=
-[
÷
]
=
-
=
(6)
×
×
-
=
-
=
| 5 |
| 6 |
| 6 |
| 5 |
| 9 |
| 10 |
| 9 |
| 5 |
=1-
| 1 |
| 2 |
=
| 1 |
| 2 |
(2)4-
| 5 |
| 11 |
| 7 |
| 11 |
=4-(
| 5 |
| 11 |
| 7 |
| 11 |
=4-1
| 1 |
| 11 |
=2
| 10 |
| 11 |
(3)
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
=
| 1 |
| 8 |
=
| 1 |
| 8 |
=12.5
(4)
| 4 |
| 5 |
| 4 |
| 7 |
| 2 |
| 5 |
| 3 |
| 5 |
=
| 16 |
| 35 |
| 2 |
| 3 |
=
| 118 |
| 105 |
(5)
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 2 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 1 |
| 8 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 1 |
| 5 |
=
| 3 |
| 5 |
(6)
| 4 |
| 5 |
| 4 |
| 7 |
| 5 |
| 4 |
| 1 |
| 2 |
=
| 4 |
| 7 |
| 1 |
| 2 |
=
| 1 |
| 14 |
点评:计算四则混合运算时,要按照运算顺序,先算乘除,后算加减,有括号的先算括号里面的,再算括号外面的.能简算的要简算.
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