试题:
怎样算简便就怎样算.
[(
14
19
-
5
13
)+
5
19
-
8
13
11
12

34×(
1
17
+
1
13
)×13
[1-(
1
2
-
1
4
)]×
2
3

1375+450÷18×25.

答案:

我来补答
(1)[(
14
19
-
5
13
)+
5
19
-
8
13
11
12

=[
14
19
-
5
13
+
5
19
-
8
13
11
12

=[
14
19
+
5
19
-(
5
13
+
8
13
)]÷
11
12

=[1-1]÷
11
12

=0;

(2)34×(
1
17
+
1
13
)×13,
=34×
1
17
×13+34×
1
13
×13,
=26+34,
=60;

(3)[1-(
1
2
-
1
4
)]×
2
3

=[1-
1
4
2
3

=
3
4
×
2
3

=
1
2


(4)1375+450÷18×25,
=1375+25×25,
=1375+625,
=2000.
 
 
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剩余:2000
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