题目内容
计算.
|
[
|
分析:(1)先算小括号里面的减法,再运用除法的性质简算;
(2)先算小括号里面的减法,再算中括号里面的除法,然后算中括号里面的加法,最后算括号外的乘法.
(2)先算小括号里面的减法,再算中括号里面的除法,然后算中括号里面的加法,最后算括号外的乘法.
解答:解:(1)
÷[(
+
)×
],
=
÷[
×
],
=
÷
÷
,
=1÷
,
=
;
(2)[
÷(3
-1
)+
]×
,
=[
÷
+
]×
,
=[10+
]×
,
=10
×
,
=
.
| 3 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
| 3 |
| 8 |
=
| 3 |
| 8 |
| 9 |
| 20 |
| 3 |
| 8 |
=
| 3 |
| 8 |
| 3 |
| 8 |
| 9 |
| 20 |
=1÷
| 9 |
| 20 |
=
| 20 |
| 9 |
(2)[
| 33 |
| 2 |
| 2 |
| 5 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 13 |
=[
| 33 |
| 2 |
| 33 |
| 20 |
| 5 |
| 6 |
| 3 |
| 13 |
=[10+
| 5 |
| 6 |
| 3 |
| 13 |
=10
| 5 |
| 6 |
| 3 |
| 13 |
=
| 5 |
| 2 |
点评:本题运算步骤较多,先找出运算的顺序,然后按照运算顺序细心计算.
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