题目内容

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
)]
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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