法琳慧的父亲
幼苗
共回答了11个问题采纳率:90.9% 举报
(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 .
1年前
7