https://olm.vn/hoi-dap/tim-kiem?q=m%E1%BB%99t+mi%E1%BA%BFng+b%C3%ACa+h%C3%ACnh+ch%E1%BB%AF+nh%E1%BA%ADt+c%C3%B3+n%E1%BB%ADa+chu+vi+l%C3%A0+3%2F5m+chi%E1%BB%81u+d%C3%A0i+h%C6%A1n+chi%E1%BB%81u+r%E1%BB%99ng+3%2F4+m.T%C3%ADnh+di%E1%BB%87n+t%C3%ADch+v%C3%A0+chu+vi+c%E1%BB%A7a+mi%E1%BA%BFng+b%C3%ACa+%C4%91%C3%B3&subject=0
Chu vi miếng bìa đó là:
3/5x2=6/5(m)
P/s: Bạn xem lại đề bài nhé.
đợi mai mình xem lại đề bài
https://olm.vn/hoi-dap/tim-kiem?q=m%E1%BB%99t+mi%E1%BA%BFng+b%C3%ACa+h%C3%ACnh+ch%E1%BB%AF+nh%E1%BA%ADt+c%C3%B3+n%E1%BB%ADa+chu+vi+l%C3%A0+3%2F5m+chi%E1%BB%81u+d%C3%A0i+h%C6%A1n+chi%E1%BB%81u+r%E1%BB%99ng+3%2F4+m.T%C3%ADnh+di%E1%BB%87n+t%C3%ADch+v%C3%A0+chu+vi+c%E1%BB%A7a+mi%E1%BA%BFng+b%C3%ACa+%C4%91%C3%B3&subject=0