1) (а-2у)^2 +4у(а-у)=а^2 - 4ау+4у^2 +4ау-4у^2 =а^2
2)(2m−3)(2m+3)−(2m−1)^2 = 4m^2-9-(4m^2-4m+1)=4m^2-9-4m^2+4m-1=4m-10
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1) (а-2у)^2 +4у(а-у)=а^2 - 4ау+4у^2 +4ау-4у^2 =а^2
2)(2m−3)(2m+3)−(2m−1)^2 = 4m^2-9-(4m^2-4m+1)=4m^2-9-4m^2+4m-1=4m-10