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](/uploads/image/z/1752108-60-8.jpg?t=%E4%BC%9A%E6%BB%B4%E6%9D%A5%E3%80%811.x%2By%2Fx-2%2Bx-y%2F2-x%3D2.%281%2Fa%29%C3%B7%EF%BC%881%2Fa%2B1%29%3D3.%E5%B7%B2%E7%9F%A5%E5%88%86%E5%BC%8F2x-m%2Fx%2Bn%2C%E5%BD%93x%3D2%E6%97%B6%2C%E5%88%86%E5%BC%8F%E7%9A%84%E5%80%BC%E4%B8%BA0%2C%E5%BD%93x%3D-1%E6%97%B6%2C%E5%88%86%E5%BC%8F%E6%97%A0%E6%84%8F%E4%B9%89%2C%E5%88%99m%2Bn%3D4.-a%5E3%2F2c%C3%B75a%5E2%2F-6cd5.y-3%2F4y-8%C3%B7%EF%BC%88y%2B2-5%2Fy-2%297.1%2B%28a-1%2F1-a%29%C3%B7%281%2Ba%2Fa%5E2-2a%2B1%298.%EF%BC%88x%2Fx-y-1%29%C3%B7y%5E2%2Fx%2By%C3%97%EF%BC%88x-x%5E2%2Fx%2By%29%2C%E5%85%B6)
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)