zhtoto007
幼苗
共回答了14个问题采纳率:85.7% 举报
(1)
1
2 ÷[(
5
8 -
1
2 )×
1
3 ]
=
1
2 ÷[
1
8 ×
1
3 ]
=
1
2 ÷
1
24
=12;
(2) (
2
3 -
4
7 )×21+
4
5
=
2
3 ×21-
4
7 ×21+
4
5
=14-12+
4
5
=2+
4
5
=2
4
5 ;
(3) (7-6×
2
3 )÷
7
9
= (7-4)÷
7
9
=3÷
7
9
=
27
7 ;
(4) (
7
8 -
1
4 )÷(
5
9 -
1
3 )
=
5
8 ÷
2
9
=
45
16 .
1年前
2