题目内容
计算下列各题.
(
-
÷
)×
20-
÷
×
×32÷
×
.
(
11 |
3 |
4 |
5 |
3 |
4 |
3 |
4 |
20-
31 |
8 |
31 |
40 |
1 |
5 |
7 |
25 |
31 |
40 |
5 |
8 |
分析:(1)先算除法,再算减法,最后算乘法;
(2)先算除法,再算乘法,最后算减法;
(3)把除法改为乘法,再进一步约分计算即可.
(2)先算除法,再算乘法,最后算减法;
(3)把除法改为乘法,再进一步约分计算即可.
解答:解:(1)(
-
÷
)×
=(
-
×
)×
=(
-
)×
=
×
=
;
(2)20-
÷
×
=20-
×
×
=20-1
=19;
(3)
×32÷
×
=
×32×
×
=
.
11 |
3 |
4 |
5 |
3 |
4 |
3 |
4 |
=(
11 |
3 |
4 |
5 |
4 |
3 |
3 |
4 |
=(
11 |
3 |
16 |
15 |
3 |
4 |
=
13 |
5 |
3 |
4 |
=
39 |
20 |
(2)20-
31 |
8 |
31 |
40 |
1 |
5 |
=20-
31 |
8 |
40 |
31 |
1 |
5 |
=20-1
=19;
(3)
7 |
25 |
31 |
40 |
5 |
8 |
=
7 |
25 |
40 |
31 |
5 |
8 |
=
224 |
31 |
点评:分数四则混合运算的运算,关键是搞清运算顺序,正确按运算顺序计算即可.

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