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计算,能简便的用简便方法算.45÷57÷78-13.47-8÷17-317×32.8×14+7.2÷41320×17+3÷201379100×101(518÷13+518)×0.25
题目详情
计算,能简便的用简便方法算. 45÷
| 3.47-8÷17-
| 2.8×
| ||||||||||||
|
| (
|
▼优质解答
答案和解析
(1)45÷
÷
-1
=45×
×
-1
=72-1
=71;
(2)3.47-8÷17-
×3
=3.47-(
+
)
=3.47-1
=2.47;
(3)2.8×
+7.2÷4
=2.8×
+7.2×
=(7.2+2.8)×
=10×
=
;
(4)
×17+3÷
=
×17+3×
=(17+3)×
=20×
=13;
(5)
×101
=
×100+
×1
=79+
=79
;
(6)(
÷
+
)×0.25
=(
×3+
)×0.25
=
×4×0.25
=
.
5 |
7 |
7 |
8 |
=45×
7 |
5 |
8 |
7 |
=72-1
=71;
(2)3.47-8÷17-
3 |
17 |
=3.47-(
8 |
17 |
9 |
17 |
=3.47-1
=2.47;
(3)2.8×
1 |
4 |
=2.8×
1 |
4 |
1 |
4 |
=(7.2+2.8)×
1 |
4 |
=10×
1 |
4 |
=
5 |
2 |
(4)
13 |
20 |
20 |
13 |
=
13 |
20 |
13 |
20 |
=(17+3)×
13 |
20 |
=20×
13 |
20 |
=13;
(5)
79 |
100 |
=
79 |
100 |
79 |
100 |
=79+
79 |
100 |
=79
79 |
100 |
(6)(
5 |
18 |
1 |
3 |
5 |
18 |
=(
5 |
18 |
5 |
18 |
=
5 |
18 |
=
5 |
18 |
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