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下面各题,能简算的要简算.(512+119)×12+719=[34-(13−14)]÷45=127×117×(2012×42×85)=

题目详情
下面各题,能简算的要简算.
(
5
12
+
1
19
)×12+
7
19
=
[
3
4
-(
1
3
1
4
)]÷
4
5
=
1
27
×
1
17
×(2012×42×85)=
▼优质解答
答案和解析
(1)(
5
12
+
1
19
)×12+
7
19

=5+
12
19
+
7
19

=5+(
12
19
+
7
19

=5+1
=6;

(2)[
3
4
-(
1
3
1
4
)]÷
4
5

=[
3
4
-
1
3
+
1
4
4
5

=[1-
1
3
4
5

=
2
3
÷
4
5

=
5
6


(3)
1
27
×
1
17
×(2012×42×85)
=(
1
27
×42)×(
1
17
×85)×2012
=
14
9
×5×2012
=
140840
9