Ответы и объяснения

Лучший Ответ!
2012-10-24T17:21:09+04:00

1) (2a/b^{2}-1/2a):(1/b+1/2a)=((4a^{2}-b^{2})/(2ab^{2})):((2a+b)/(2ab))=((4a^{2}-b^{2})*2ab)/(2ab^{2}*(2a+b))=(4a^{2}-b^{2})/(b*(2a+b))=((2a-b)(2a+b))/(b*(2a+b))=(2a-b)/b

2) (2m/(2m-1) +1)*((6m-3)/(4m^{2}-m))=((4m-1)*(6m-3))/((2m-1)*(4m^{2}-m))=((4m-1)*3(2m-1))/(2m-1)*m(4m-1)=3/m

3) ((y-3)/(y+3))*(y+(y^{2}/(3-y))=((y-3)/(y+3))*((y*(3-y)+y^{2})/(3-y))=-((y-3)*3y)/((y+3)*(y-3))=-3y/(y+3)