题目内容
(2012?和平区模拟)脱式计算:
| (1)516÷12+67 | (2)[
|
(3)(1÷
|
分析:本题根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
(3)可根据乘法分配律计算.
(3)可根据乘法分配律计算.
解答:解:(1)516÷12+67
=43+67,
=110;
(2)[
+(
-
)]÷
=[
+
]×
,
=
×
,
=
;
(3)(1÷
+
÷1)×8
=(4+
)×8,
=4×8+
×8,
=32+2,
=34.
=43+67,
=110;
(2)[
| 2 |
| 3 |
| 7 |
| 10 |
| 1 |
| 6 |
| 4 |
| 5 |
=[
| 2 |
| 3 |
| 16 |
| 30 |
| 5 |
| 4 |
=
| 6 |
| 5 |
| 5 |
| 4 |
=
| 3 |
| 2 |
(3)(1÷
| 1 |
| 4 |
| 1 |
| 4 |
=(4+
| 1 |
| 4 |
=4×8+
| 1 |
| 4 |
=32+2,
=34.
点评:当算式中同时含有中括号与小括号时,要注意先算小括号里面的,再算中括号里面的.
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