题目内容
先说出运算顺序,再计算.
3-
÷
×
(1-
×
)÷
12÷[(
-
)×
]
[
+(
+
)]×
.
3-
8 |
9 |
5 |
6 |
3 |
16 |
(1-
1 |
4 |
8 |
9 |
7 |
9 |
12÷[(
7 |
9 |
2 |
3 |
9 |
10 |
[
1 |
4 |
1 |
6 |
2 |
3 |
2 |
3 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再算乘法,最后算减法;
(2)先算乘法,再算减法,最后算除法;
(3)先算减法,再算乘法,最后算除法;
(4)先算小括号里面的加法,再算中括号里面的加法,最后算乘法.
(2)先算乘法,再算减法,最后算除法;
(3)先算减法,再算乘法,最后算除法;
(4)先算小括号里面的加法,再算中括号里面的加法,最后算乘法.
解答:
解:(1)3-
÷
×
=3-
×
=3-
=2
;
(2)(1-
×
)÷
=(1-
)÷
=
÷
=1;
(3)12÷[(
-
)×
]
=12÷[
×
]
=12÷
=120;
(4)[
+(
+
)]×
=[
+
]×
=
×
=
.
8 |
9 |
5 |
6 |
3 |
16 |
=3-
16 |
15 |
3 |
16 |
=3-
1 |
5 |
=2
4 |
5 |
(2)(1-
1 |
4 |
8 |
9 |
7 |
9 |
=(1-
2 |
9 |
7 |
9 |
=
7 |
9 |
7 |
9 |
=1;
(3)12÷[(
7 |
9 |
2 |
3 |
9 |
10 |
=12÷[
1 |
9 |
9 |
10 |
=12÷
1 |
10 |
=120;
(4)[
1 |
4 |
1 |
6 |
2 |
3 |
2 |
3 |
=[
1 |
4 |
5 |
6 |
2 |
3 |
=
13 |
12 |
2 |
3 |
=
13 |
18 |
点评:考查了四则混合运算注意运算顺序和运算法则,然后再进一步计算.
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