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.

问题描述:

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.

(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.