题目内容

计算,能简算的写出简算过程.
(1)7.5÷
2
5
-2.5×
5
2

(2)3.5×
4
5
+5.5×80%+0.8
(3)24×[(1
1
6
-
2
3
)÷3]
(4)3.25-2.8×
5
7
+
1
4
×
4
7
÷0.1.

(1)7.5÷
2
5
-2.5×
5
2

=7.5×
5
2
-2.5×
5
2

=(7.5-2.5)×
5
2

=5×
5
2

=
25
2


(2)3.5×
4
5
+5.5×80%+0.8,
=3.5×0.8+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;

(3)24×[(1
1
6
-
2
3
)÷3],
=24×[
1
2
÷3],
=24×
1
6

=4;

(4)3.25-2.8×
5
7
+
1
4
×
4
7
÷0.1,
=3.25-2+
1
7
÷0.1,
=3.25-2+
10
7

=1.25+
10
7

=2
19
28
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