题目内容
用合适的方法计算下列各题:
|
(1+
| ||||||||||
|
| ||||||||||
|
|
分析:本题根据分数乘法、除法及四则混合运算的运算法则计算即可;
(1+
)×12;
×32+32×
可根据乘法分配律进行计算.
(1+
3 |
8 |
7 |
16 |
9 |
16 |
解答:解:
×
×
=
×
,
=
;
(1+
)×12
=1×12+
×12,
=12+
,
=12+4
,
=16
;
×32+32×
=(
+
)×32,
=1×32,
=32;
×
÷
=
×
,
=
;
÷
×
=
×
×
,
=
×
,
=
;
×8+
÷8
=
+
×
,
=3
+
,
=3
.
5 |
6 |
12 |
21 |
7 |
15 |
=
2 |
3 |
1 |
3 |
=
2 |
9 |
(1+
3 |
8 |
=1×12+
3 |
8 |
=12+
9 |
2 |
=12+4
1 |
2 |
=16
1 |
2 |
7 |
16 |
9 |
16 |
=(
7 |
16 |
9 |
16 |
=1×32,
=32;
4 |
7 |
7 |
12 |
4 |
9 |
=
1 |
3 |
9 |
4 |
=
3 |
4 |
5 |
8 |
3 |
4 |
9 |
25 |
=
5 |
8 |
4 |
3 |
9 |
25 |
=
1 |
2 |
3 |
5 |
=
3 |
10 |
8 |
17 |
8 |
17 |
=
64 |
17 |
8 |
17 |
1 |
8 |
=3
13 |
17 |
1 |
17 |
=3
14 |
17 |
点评:完成有关于分数的四则混合运算题目时要注意通分约分,和灵活运用运算定律简算.
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