问题 解答题
计算下面各题,能简算的要简算
6.75-(4.2+1.75)
3.5×(20.6-16.8÷4.8)[
3
4
-(
5
6
-
2
3
)]÷
5
4
48.38-21.63-8.37
3
2
-
2
3
+
1
4
)×12
3
4
÷[
5
8
-(
3
16
+
1
4
)]
答案

解(1)6.75-(4.2+1.75),

=6.75-1.75-4.2,

=0.8;

(2)3.5×(20.6-16.8÷4.8),

=3.5×(20.6-3.5),

=3.5×17.1,

=59.85;

(3)[

3
4
-(
5
6
-
2
3
)]÷
5
4

=[

3
4
-
1
6
5
4

=

7
12
×
4
5

=

7
15

(4)48.38-21.63-8.37,

=48.38-(8.37+21.63),

=48.38-30,

=18.38;

(5)(

3
2
-
2
3
+
1
4
)×12,

=

3
2
×12-
2
3
×12+
1
4
×12,

=18-8+3,

=13;

(6)

3
4
÷[
5
8
-(
3
16
+
1
4
)],

=

3
4
÷[
5
8
-
7
16
],

=

3
4
÷[
10
16
-
7
16
],

=

3
4
÷
3
16

=

3
4
×
16
3

=4.

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