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y=66 2/3 % x=66,67%x=0,67x =- drugi bok
O= 40 dm - obwód
O=2x+2y
40=2x+2*0,67x
40=2x+1,34x
40=3,34x/:3,34
x=12
y=8
P=x*y=12*8=96