Musafu
幼苗
共回答了19个问题采纳率:89.5% 举报
(1)
1
3 :
1
20 =
7
9 :x,
1
3 x=
1
20 ×
7
9 ,
1
3 x=
7
180 ,
1
3 x÷
1
3 =
7
180 ÷
1
3 ,
x=
7
60 ;
(2)
1
2 :x=
1
6 :
3
5 ,
x×
1
6 =
1
2 ×
3
5 ,
1
6 x=
3
10 ,
1
6 x÷
1
6 =
3
10 ÷
1
6 ,
x= 1
4
5 ;
(3)
5
7 ÷
9
14 ×
4
5 ,
=
5
7 ×
14
9 ×
4
5 ,
=
8
9 ;
(4)
7
18 ×
2
5 +
3
5 ×
7
18 ,
=
7
18 ×(
2
5 +
3
5 ),
=
7
18 ×1,
=
7
18 ;
(5)
5
6 :
2
3 =
3
4 :x,
5
6 ×x=
2
3 ×
3
4 ,
5
6 x=
1
2 ,
5
6 x÷
5
6 =
1
2 ÷
5
6 ,
x=
3
5 ;
(6)2.25:12=a:4,
12×a=2.25×4,
12a=9,
12a÷12=9÷12,
a=
3
4 ;
(7)1.5:8=
x
0.8 ,
8×x=1.5×0.8,
8x=1.2,
8x÷8=1.2÷8,
x=0.15.
1年前
7