问题 解答题
怎样简便怎样算
3
7
-
3
7
÷3   
1
3
-
1
6
+
1
4
)×12  
11
20
÷[
1
2
×(
2
3
+
4
5
)]
0.625×(8.3-2.5×12%) 
6.8×2.5+2.5×3.2  
7
4
×
5
8
+
1
4
÷
8
5
答案

(1)3÷

3
7
-
3
7
÷3,

=3×

7
3
-
3
7
×
1
3

=7-

1
7

=6

6
7

(2)(

1
3
-
1
6
+
1
4
)×12,

=

1
3
×12-
1
6
×12+
1
4
×12,

=4-2+3,

=5;

(3)

11
20
÷[
1
2
×(
2
3
+
4
5
)],

=

11
20
÷[
1
2
×
2
3
+
1
2
×
4
5
],

=

11
20
÷[
1
3
+
2
5
],

=

11
20
×
15
11

=

3
4

(4)0.625×(8.3-2.5×12%),

=0.625×(8.3-0.3),

=

5
8
×8,

=5;

(5)6.8×2.5+2.5×3.2,

=(6.8+3.2)×2.5,

=10×2.5,

=25;

(6)

7
4
×
5
8
+
1
4
÷
8
5

=

7
4
×
5
8
+
1
4
×
5
8

=(

7
4
+
1
4
)×
5
8

=

8
4
×
5
8

=

5
4

=1

1
4

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