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^34.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=
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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[(x-y)^2-(x+2y)(x-2y)]/y
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x^2(x-y)+(y-x)
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计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x
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化简:[(x+y)(x-y)(x+y)^2-2y(x-2y)](-2y) 谢谢!
计算:[(x+y)(x-y)-(x-y)^2+2y(x-y)]/(-2y)