题目内容
能简算的简算
(1)
|
(2)
|
(3)
| ||||||||||||||||
(4)15÷
|
(5)(
|
(6)
|
分析:(1)把除以4化成乘它的倒数来计算,
(2)把除法化成乘它的倒数计算,
(3)把除法化成乘法,运用乘法分配律进行简算计算,
(4)把除法化成乘它的倒数计算,
(5)把除法化成乘它的倒数计算,运用乘法分配律进行简算计算,
(6)先算乘法,再算减法.
(2)把除法化成乘它的倒数计算,
(3)把除法化成乘法,运用乘法分配律进行简算计算,
(4)把除法化成乘它的倒数计算,
(5)把除法化成乘它的倒数计算,运用乘法分配律进行简算计算,
(6)先算乘法,再算减法.
解答:解:(1)
÷4×
,
=
×
×
,
=
;
(2)
÷
÷
,
=
×
×3,
=
,
=4
;
(3)
÷
+
,
=
×99+
,
=
×(99+1),
=
×100,
=20;
(4)15÷
÷
,
=15×2×
,
=45;
(5)(
-
)÷
,
=(
-
)×24,
=
×24-
×24,
=22-15,
=7;
(6)
×
+
,
=
+
,
=
.
8 |
13 |
5 |
6 |
=
8 |
13 |
1 |
4 |
5 |
6 |
=
5 |
39 |
(2)
8 |
9 |
4 |
7 |
1 |
3 |
=
8 |
9 |
7 |
4 |
=
14 |
3 |
=4
2 |
3 |
(3)
1 |
5 |
1 |
99 |
1 |
5 |
=
1 |
5 |
1 |
5 |
=
1 |
5 |
=
1 |
5 |
=20;
(4)15÷
1 |
2 |
2 |
3 |
=15×2×
3 |
2 |
=45;
(5)(
11 |
12 |
5 |
8 |
1 |
24 |
=(
11 |
12 |
5 |
8 |
=
11 |
12 |
5 |
8 |
=22-15,
=7;
(6)
3 |
7 |
4 |
9 |
2 |
3 |
=
4 |
21 |
2 |
3 |
=
6 |
7 |
点评:考查了分数四则运算的顺序,注意简算.
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