Ответы и объяснения

2012-11-09T08:54:12+00:00

1)x(x+y)*y^2/xy=(x+y)*y=xy+y^2

2)x-5(x+y)+1(x-y)/(x+5)(x-5)=x-5x-5y+x-y/(x+5)(x-5)=-3x-6y/(x+5)(x-5)=-3(x+2y)/(x+5)(x-5)

3)(x-y)(x+y)*2y/4xy*(x-y)=x+y/2x

4)xy*(x-3y)(x+3y)/(x-3y)^2*yx=x+3y/x-3y

5)x+2*2y/y^2*(x+2)=2/y

6)(a^2-3a)*4b/3a*4b^2=a(a-3)/3ab

7)3x^2y*25/5*6xy^2=5x/2y

8)4xy^3*x/6y^3=2x^2/3

9)y(x-y)/x*(y-x)=-y/x