问题 解答题
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

(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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