题目内容
脱式计算
×
÷
[1-(
+
)]÷
8×
+
÷4
÷(
+
)
(
+
)÷(1-
×
)
7 |
8 |
5 |
16 |
21 |
32 |
[1-(
1 |
4 |
3 |
8 |
1 |
4 |
8×
5 |
8 |
2 |
5 |
2 |
5 |
3 |
4 |
2 |
5 |
(
1 |
4 |
5 |
6 |
3 |
4 |
4 |
5 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)按照从左向右的顺序进行计算;
(2)先算加法,再算减法,最后算除法;
(3)先算乘法和除法,再算加法;
(4)先算加法,再算除法;
(5)先算加法和乘法,再算减法,最后算除法.
(2)先算加法,再算减法,最后算除法;
(3)先算乘法和除法,再算加法;
(4)先算加法,再算除法;
(5)先算加法和乘法,再算减法,最后算除法.
解答:
解:(1)
×
÷
=
÷
=
;
(2)[1-(
+
)]÷
=[1-
]÷
=
÷
=
;
(3)8×
+
÷4
=5+
=5
;
(4)
÷(
+
)
=
÷
=
;
(5)(
+
)÷(1-
×
)
=
÷(1-
)
=
÷
=
.
7 |
8 |
5 |
16 |
21 |
32 |
=
35 |
128 |
21 |
32 |
=
5 |
12 |
(2)[1-(
1 |
4 |
3 |
8 |
1 |
4 |
=[1-
5 |
8 |
1 |
4 |
=
3 |
8 |
1 |
4 |
=
3 |
2 |
(3)8×
5 |
8 |
2 |
5 |
=5+
1 |
10 |
=5
1 |
10 |
(4)
2 |
5 |
3 |
4 |
2 |
5 |
=
2 |
5 |
23 |
20 |
=
8 |
23 |
(5)(
1 |
4 |
5 |
6 |
3 |
4 |
4 |
5 |
=
13 |
12 |
3 |
5 |
=
13 |
12 |
2 |
5 |
=
65 |
24 |
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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