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x- dł boku kwadratu
x+3-jeden bok brostokąta
x-10-drugi bok prostokąta
x²-170=(x+3)*(x-10)
x²-170=x²-10x+3x-30
x²-x²+7x=170-30
7x=140 /:7
x=20
20+3=23- jeden bok prostokąta
20-10=10-drugi bok prostokąta
Obwód prostokąta: 2*23+2*10=66cm
3b=
30*(30-3):2=30*27:2=405