会滴来、1.x+y/x-2+x-y/2-x=2.(1/a)÷(1/a+1)=3.已知分式2x-m/x+n,当x=2时,分式的值为0,当x=-1时,分式无意义,则m+n=4.-a^3/2c÷5a^2/-6cd5.y-3/4y-8÷(y+2-5/y-2)7.1+(a-1/1-a)÷(1+a/a^2-2a+1)8.(x/x-y-1)÷y^2/x+y×(x-x^2/x+y),其
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会滴来、1.x+y/x-2+x-y/2-x=2.(1/a)÷(1/a+1)=3.已知分式2x-m/x+n,当x=2时,分式的值为0,当x=-1时,分式无意义,则m+n=4.-a^3/2c÷5a^2/-6cd5.y-3/4y-8÷(y+2-5/y-2)7.1+(a-1/1-a)÷(1+a/a^2-2a+1)8.(x/x-y-1)÷y^2/x+y×(x-x^2/x+y),其
会滴来、
1.x+y/x-2+x-y/2-x=
2.(1/a)÷(1/a+1)=
3.已知分式2x-m/x+n,当x=2时,分式的值为0,当x=-1时,分式无意义,则m+n=
4.-a^3/2c÷5a^2/-6cd
5.y-3/4y-8÷(y+2-5/y-2)
7.1+(a-1/1-a)÷(1+a/a^2-2a+1)
8.(x/x-y-1)÷y^2/x+y×(x-x^2/x+y),其中,x=-2,y=-1
9.x+2/x-2=x/x+1
会滴来、1.x+y/x-2+x-y/2-x=2.(1/a)÷(1/a+1)=3.已知分式2x-m/x+n,当x=2时,分式的值为0,当x=-1时,分式无意义,则m+n=4.-a^3/2c÷5a^2/-6cd5.y-3/4y-8÷(y+2-5/y-2)7.1+(a-1/1-a)÷(1+a/a^2-2a+1)8.(x/x-y-1)÷y^2/x+y×(x-x^2/x+y),其
1、(x+y)/(x-2)+(x-y)/(2-x)=(x+y)/(x-2)-(x-y)/(x-2)=2*y/(x-2)
2、原式=(1/a)*(a+1)=1+1/a
3、x=2时分式值为0得m=4,x=-1时分式无意义得n=1,m+n=5
4、原式=( -a^3/2c)*(-6cd/5a^2)=3ad/5
5、(y-3)/(4y-8)÷(y+2-5/y-2)=(y-3)/(4y-8)÷[(y+2)*(y-2)/(y-2)-5/(y-2)]
=(y-3)/(4y-8)÷[(y^2-4-5)/(y-2)]=(y-3)/[4*(y-2)]*(y-2)/[y+3)*(y-3)]
=1/[4*(y+3)]
7、貌似题目有点问题,没看明白
1+[(a-1/1-a)÷(1+a/a^2-2a+1)]=1+[-1*(a-1)^2/(a+1)]=(-a^2+3a)/(1+a)
1+[(a+1/1-a)÷(1+a/a^2-2a+1)]=2-a
1+[(a-1/1-a)÷(1+a/a^2+2a+1)]=-a
8、(x/x-y-1)÷y^2/(x+y)×(x-x^2/x+y)=x^2*(1-x)/[y^2*(x-y-1)]=4*3/(-2)=-6
9、 x+2/x-2+x/x+1=( x+2)*(x+1)/(x-2)*(x+1)+x*(x-2)/(x-2)*(x+1)=(2*x^2+x+2)/(x^2-x-2)