Question

用方程解

Answer 1

 

追答

亲。采纳吧=_=

Answer 2

1:30 2:80

Answer 3

1，30。2，8O

Answer 4

1:30 2:80

Answer 5

1:30 2:80

追答

2:80要简化

1:40

Answer 6

1：30 2：80