1.(x+y)(x-y)(x^2+y^2)=( )
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1.(x+y)(x-y)(x^2+y^2)=( )
2.若x^2+mx+1/4 是一个完全平方式,则m的值为( )
3.12x^7y^6z^5÷( )=4x^3y^3z^3
4.若(x+6)(x-7)=x^2+mx+n,则m=( ),n=( )
5.已知x+1/x=3,则x^2+1/x^2=
2.若x^2+mx+1/4 是一个完全平方式,则m的值为( )
3.12x^7y^6z^5÷( )=4x^3y^3z^3
4.若(x+6)(x-7)=x^2+mx+n,则m=( ),n=( )
5.已知x+1/x=3,则x^2+1/x^2=
1.(x+y)(x-y)=x^2-y^2
.(x+y)(x-y)(x^2+y^2)=x^4-y^4
2.x^2+mx+1/4 =(x+(-)1/2)^2
m=1或-1
3.(3x^4)(y^3)(z^2)
4.(x+6)(x-7)=x^2-x-42
m=-1 n=-42
5..(x+1/x)^2=x^2+1/x^2+2=9
x^2+1/x^2=7
.(x+y)(x-y)(x^2+y^2)=x^4-y^4
2.x^2+mx+1/4 =(x+(-)1/2)^2
m=1或-1
3.(3x^4)(y^3)(z^2)
4.(x+6)(x-7)=x^2-x-42
m=-1 n=-42
5..(x+1/x)^2=x^2+1/x^2+2=9
x^2+1/x^2=7
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
先化简 再求值(x-2y)(2y-x)+(2x+y)(2x-y )-(x-2y)(2x+y) 其中x=-2,y=-1.
1.[(x-y)^2-2(y -x)]÷(x-y)
1、x(x-y)(x+y)-x(x+y)^2
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
1.(x-2y)(x+2y)-(x平方+y)(x平方-y) 2.(2x-y)(y+2x)-(2y+x)(2y-x)
y'-2y=(e^x)-x
y'+2y/x=x通解
(x-y/x+2y)³
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2