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怎样算简便就怎样算.2.5×(0.87×4)65×63641-(14+13)÷7879÷115+29×51125÷(34+25)0.9+9×910

题目详情
怎样算简便就怎样算.
2.5×(0.87×4)
65×
63
64
1-(
1
4
+
1
3
)÷
7
8
7
9
÷
11
5
+
2
9
×
5
11
          
2
5
÷(
3
4
+
2
5
)      
0.9+9×
9
10
▼优质解答
答案和解析
(1)2.5×(0.87×4)
=2.5×4×0.87
=8.7;

(2)65×
63
64

=(64+1)×
63
64

=64×
63
64
+
63
64

=63
63
64


(3)1-(
1
4
+
1
3
)÷
7
8

=1-
2
3

=
1
3


(4)
7
9
÷
11
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11

=(
2
9
+
7
9
)×
5
11

=
5
11


(5)
2
5
÷(
3
4
+
2
5

=
2
5
÷
23
20

=
2
5
×
20
23

=
8
23


(6)0.9+9×