题目内容
(2012?北京模拟)计算下面各题.
(1)(
-
)×
(2)
×[(
+
)÷
].
(1)(
7 |
12 |
1 |
3 |
2 |
7 |
(2)
5 |
11 |
2 |
5 |
1 |
3 |
5 |
6 |
分析:(1)先计算减法,再计算乘法;
(2)先计算小括号里面的加法,再计算中括号里面的除法,最后算乘法.
(2)先计算小括号里面的加法,再计算中括号里面的除法,最后算乘法.
解答:解:(1)(
-
)×
,
=
×
,
=
;
(2)
×[(
+
)÷
],
=
×[
÷
],
=
×[
×
]
=
×
×
,
=
.
7 |
12 |
1 |
3 |
2 |
7 |
=
1 |
4 |
2 |
7 |
=
1 |
14 |
(2)
5 |
11 |
2 |
5 |
1 |
3 |
5 |
6 |
=
5 |
11 |
11 |
15 |
5 |
6 |
=
5 |
11 |
11 |
15 |
6 |
5 |
=
5 |
11 |
11 |
15 |
6 |
5 |
=
2 |
5 |
点评:先弄清四则混合运算的顺序,然后再进一步计算即可.
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