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[ccobedethuong282]

Chao ban , chac ban dang hoc lop 9 , minh thay bai nay ko kho lam
Bay gio ban goi chieu dai la x, chieu rong la y (dk x>y)
Theo bai ra ta co
S=2a2 va P=6a
 xy=2a2 (1) va 2(x+y)=6a hay x+y=3a (2)
Tu (2) =>x=3a-y thay vao (1)ta duoc
(3a-y)y=2a2
<=>y2-3ay+2a2=0
Giai pt suy ra y=a =>x=2a hoac y=2a =>x=a (loai)
Vay chieu dai la 2a ,chieu rong la a,tuong duong voichieu cao la 2a va duong kinh la a . Tu day ban suy ra ban kinh (co chieu cao , ban kinh de dang tinh duoc DTXQva TT)ban hay kiem tra cach giai cua minh nhe (co the xo suat)chuc ban ngay cang hoc gioi
(vi minh moi len lai nen ko biet ban gui o cho nao (kiem hoai ko duoc))