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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