Ответы и объяснения

2013-03-28T13:17:09+04:00

1) (x/2-x/3)*5/x²=(3x-2x)/6*5/x²=x/6*5/x²=5/(6x)
2)y²/4*(y/5-2/y²)= y²/4*y/5-y²/4*2/y²=y³/20-1/2
4)12x/(x-y) :(x/6-y/6)= 12x/(x-y) : ((x-y)/6)=12x/(x-y)*6/(x-y)=72x / (x-y)²