题目内容

用你喜欢的方法计算.
15
3
14
-4.25-5
3
4
25×32×125
[4-(
3
4
-
3
8
)]×
4
29
8
3
+5.2×
3
8
709×99+7092.5×
3
7
×0.4×2
1
3
(1)15
3
14
-4.25-5
3
4

=15
3
14
-(4.25+5
3
4
),
=15
3
14
-10,
=5
3
14


(2)25×32×125,
=25×4×8×125,
=(25×4)×(8×125),
=100×1000,
=100000;

(3)[4-(
3
4
-
3
8
)]×
4
29

=[4-
3
8
4
29

=
29
8
×
4
29

=
1
2


(4)8÷
8
3
+5.2×
3
8

=8×
3
8
+5.2×
3
8

=3+1.95,
=4.95;

(5)709×99+709,
=709×(99+1),
=709×100,
=70900;

(6)2.5×
3
7
×0.4×2
1
3

=(2.5×0.4)×(
3
7
×2
1
3
),
=1×1,
=1.
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