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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÷
5
7
÷
7
8
-1        

3.47-8÷17-
3
17
×3      

2.8×
1
4
+7.2÷4
13
20
×17+3÷
20
13
79
100
×101     
5
18
÷
1
3
+
5
18
)×0.25
▼优质解答
答案和解析
(1)45÷
5
7
÷
7
8
-1 
=45×
7
5
×
8
7
-1
=72-1
=71;
(2)3.47-8÷17-
3
17
×3  
=3.47-(
8
17
+
9
17

=3.47-1
=2.47;
(3)2.8×
1
4
+7.2÷4
=2.8×
1
4
+7.2×
1
4

=(7.2+2.8)×
1
4

=10×
1
4

=
5
2

(4)
13
20
×17+3÷
20
13

=
13
20
×17+3×
13
20

=(17+3)×
13
20

=20×
13
20

=13;
(5)
79
100
×101     
=
79
100
×100+
79
100
×1
=79+
79
100

=79
79
100

(6)(
5
18
÷
1
3
+
5
18
)×0.25
=(
5
18
×3+
5
18
)×0.25
=
5
18
×4×0.25
=
5
18