题目内容
计算,能简算的要简算.
|
| ||||||||||||||
|
4÷
|
分析:(1)利用乘法分配律简算;
(2)把连除改为连乘,约分计算;
(3)带分数化为假分数,约分计算;
(4)先算除法,再算减法.
(2)把连除改为连乘,约分计算;
(3)带分数化为假分数,约分计算;
(4)先算除法,再算减法.
解答:解:(1)
×
+
×
=
×(
+
)
=
×1
=
;
(2)
÷
÷
=
×
×
=
;
(3)
×1
×
=
×
×
=
;
(4)4÷
-0.6
=4×
-0.6
=1.5-0.6
=0.9.
| 9 |
| 16 |
| 2 |
| 9 |
| 2 |
| 9 |
| 7 |
| 16 |
=
| 2 |
| 9 |
| 9 |
| 16 |
| 7 |
| 16 |
=
| 2 |
| 9 |
=
| 2 |
| 9 |
(2)
| 19 |
| 26 |
| 38 |
| 35 |
| 5 |
| 13 |
=
| 19 |
| 26 |
| 35 |
| 38 |
| 13 |
| 5 |
=
| 7 |
| 4 |
(3)
| 7 |
| 8 |
| 2 |
| 3 |
| 9 |
| 70 |
=
| 7 |
| 8 |
| 5 |
| 3 |
| 9 |
| 70 |
=
| 3 |
| 16 |
(4)4÷
| 8 |
| 3 |
=4×
| 3 |
| 8 |
=1.5-0.6
=0.9.
点评:此题考查分数四则混合运算的运算顺序以及利用运算定律简算.
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