a) 4ab+6a^2b=b(4a+6a^2)=b(2a(2+3a);
б) 5x(x-y)-3(x-y)=(x-y)(5x-3);
в) 2(x^2-1)+1-x^2=2(x^2-1)-(x^2-1)=(x^2-1)(2-1)=x^2-1=(x+1)(x-1);
г) 3ab+7b+3ac+7c=(3ab+3ac)+(7b+7c)=3a(b+c)+7(b+c)=(b+c)(3a+7).
a) 4ab+6a^2b=b(4a+6a^2)=b(2a(2+3a);
б) 5x(x-y)-3(x-y)=(x-y)(5x-3);
в) 2(x^2-1)+1-x^2=2(x^2-1)-(x^2-1)=(x^2-1)(2-1)=x^2-1=(x+1)(x-1);
г) 3ab+7b+3ac+7c=(3ab+3ac)+(7b+7c)=3a(b+c)+7(b+c)=(b+c)(3a+7).