题目内容
怎样简便就怎样计算.
÷4=
18
÷9=
0.42÷1
=
(
+
)÷
=
÷0.2×
=
÷
×
=
| 5 |
| 6 |
18
| 9 |
| 10 |
0.42÷1
| 3 |
| 7 |
(
| 4 |
| 9 |
| 2 |
| 15 |
| 2 |
| 15 |
| 3 |
| 20 |
| 1 |
| 4 |
| 4 |
| 25 |
| 4 |
| 5 |
| 4 |
| 5 |
分析:(1)(3)题根据分数除法的计算法则计算即可;
(2)(4)把除法转化成乘法,利用乘法分配律简算即可;
(5)把除法转化成乘法,约分计算即可;
(6)
÷
×
,除法和乘法相互抵销,可直接得到
.
(2)(4)把除法转化成乘法,利用乘法分配律简算即可;
(5)把除法转化成乘法,约分计算即可;
(6)
| 4 |
| 25 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 25 |
解答:解:(1)
÷4
=
×
=
;
(2)18
÷9
=18
×
=18×
+
×
=2
;
(3)0.42÷1
=0.42×
=0.294;
(4)(
+
)÷
,
=(
+
)×
=
×
+
×
=4
;
(5)
÷0.2×
=
×5×
=
;
(6)
÷
×
=
.
| 5 |
| 6 |
=
| 5 |
| 6 |
| 1 |
| 4 |
=
| 5 |
| 24 |
(2)18
| 9 |
| 10 |
=18
| 9 |
| 10 |
| 1 |
| 9 |
=18×
| 1 |
| 9 |
| 9 |
| 10 |
| 1 |
| 9 |
=2
| 1 |
| 10 |
(3)0.42÷1
| 3 |
| 7 |
=0.42×
| 7 |
| 10 |
=0.294;
(4)(
| 4 |
| 9 |
| 2 |
| 15 |
| 2 |
| 15 |
=(
| 4 |
| 9 |
| 2 |
| 15 |
| 15 |
| 2 |
=
| 4 |
| 9 |
| 15 |
| 2 |
| 2 |
| 15 |
| 15 |
| 2 |
=4
| 1 |
| 3 |
(5)
| 3 |
| 20 |
| 1 |
| 4 |
=
| 3 |
| 20 |
| 1 |
| 4 |
=
| 3 |
| 16 |
(6)
| 4 |
| 25 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 25 |
点评:此题考查了分数除法、四则混合运算,灵活运用运算定律和性质进行简算.
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