题目内容

计算下面各题,能简便计算的用简便方法计算.
4.82-5.2÷0.8×0.6

[
1
2
-(
3
4
-
3
5
)]÷
7
10
7
9
×
5
11
+
2
9
×
5
11
12.3×99
57.5-14.25-15
3
4
3.2×12.5×0.25.
(1)4.82-5.2÷0.8×0.6,
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;

(2)[
1
2
-(
3
4
-
3
5
)]÷
7
10

=[
1
2
-
3
20
7
10

=
7
20
÷
7
10

=
1
2


(3)
7
9
×
5
11
+
2
9
×
5
11

=(
7
9
+
2
9
)×
5
11

=1×
5
11

=
5
11


(4)12.3×99,
=12.3×(100-1),
=12.3×100-12.3×1,
=1230-12.3,
=1217.7;

(5)57.5-14.25-15
3
4

=57.5-(14.25+15
3
4
),
=57.5-30,
=27.5;

(6)3.2×12.5×0.25,
=8×0.4×12.5×0.25,
=(8×12.5)×(0.4×0.25),
=100×0.1,
=10.
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