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p:l=5x:2x
x=56:7
=8
p=5x
=5*8
=40
l=2x
=2*8
=16
luas=p*l
=40*16
=640 cm²
p+l = 7x = 56
x = 8
panjang = 5.8 = 40
lebar = 2.8 = 16
luas = p x l = 40 x 16 = 640