分式~会滴来哦1..-a^3/2c÷5a^2/-6cd2.y-3/4y-8÷（y+2-5/y-2)3.1+(a-1/1-a)÷(1+a/a^2-2a+1)4.（x/x-y-1)÷y^2/x+y×（x-x^2/x+y),其中,x=-2,y=-15.x+2/x-2=x/x+1

分式~会滴来哦1..-a^3/2c÷5a^2/-6cd2.y-3/4y-8÷（y+2-5/y-2)3.1+(a-1/1-a)÷(1+a/a^2-2a+1)4.（x/x-y-1)÷y^2/x+y×（x-x^2/x+y),其中,x=-2,y=-15.x+2/x-2=x/x+1
分式~会滴来哦
1..-a^3/2c÷5a^2/-6cd
2.y-3/4y-8÷（y+2-5/y-2)
3.1+(a-1/1-a)÷(1+a/a^2-2a+1)
4.（x/x-y-1)÷y^2/x+y×（x-x^2/x+y),其中,x=-2,y=-1
5.x+2/x-2=x/x+1

分式~会滴来哦1..-a^3/2c÷5a^2/-6cd2.y-3/4y-8÷（y+2-5/y-2)3.1+(a-1/1-a)÷(1+a/a^2-2a+1)4.（x/x-y-1)÷y^2/x+y×（x-x^2/x+y),其中,x=-2,y=-15.x+2/x-2=x/x+1
1..-a^3/2c÷5a^2/-6cd
=(a^3/2c)*(6cd/5a^2)=3ad/5
2.y-3/4y-8÷（y+2-5/y-2)
=[(y-3)/4(y-2)]*(y-2)/(y-3)=1/4
3.1+(a-1/1-a)÷(1+a/a^2-2a+1)
=1-1*(a+1)/(a-1)^2=(a^2+3a)/(a+1)
4.（x/x-y-1)÷y^2/x+y×（x-x^2/x+y)
=x/((x-y-1)*(x+y)/y^2*x*(1-x)/(x+y)
=x^2(1-x)/(x-y-1)
=4(1+2)/(-2+1-1)
=-6
5.x+2/x-2=x/x+1
(x+2)(x+1)=x(x-2)
x^2+3x+2=x^2-2x
x=-2/5