meixiaoyu
幼苗
共回答了14个问题采纳率:92.9% 举报
(1)6×3-1.8x=7.2,
18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
18=7.2+1.8x,
18-7.2=7.2+1.8x-7.2,
10.8=1.8x,
10.8÷1.8=1.8x÷1.8,
x=6;
(2)10:x=4.5:0.8,
4.5x=10×0.8,
4.5x=8,
4.5x÷4.5=8÷4.5,
x=
16
9 ;
(3)
1
4 :
1
8 =x:
1
10 ,
1
8 x=
1
4 ×
1
10 ,
1
8 x=
1
40 ,
1
8 x÷
1
8 =
1
40 ÷
1
8 ,
x=
1
5 .
1年前
10