Question

помогите!!!!! 3 адв 4адв

Answer 1

3.а) =x^2-y^2
д)=9*а^2-b^2
в)=9-х^2
4.а)=(19-18)*(19+18)=1*342=342
д)=(37-27)*(37+27)=10*64=640
в)=(25-24)*(25+24)=1*49=49