若x^2+2xy+y^2-a(x+y)+25是一个完全平方式,则a=_已知x^2-3xy+2y^2=0(xy不等于0),则x/y+y/x=?若(2x-1)^5=fx^5+ex^4+dx^3+cx^2+bx+a,则a=?,f+e+d+c+b=?先回答先得分
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若x^2+2xy+y^2-a(x+y)+25是一个完全平方式,则a=_已知x^2-3xy+2y^2=0(xy不等于0),则x/y+y/x=?若(2x-1)^5=fx^5+ex^4+dx^3+cx^2+bx+a,则a=?,f+e+d+c+b=?先回答先得分
若x^2+2xy+y^2-a(x+y)+25是一个完全平方式,则a=_
已知x^2-3xy+2y^2=0(xy不等于0),则x/y+y/x=?若(2x-1)^5=fx^5+ex^4+dx^3+cx^2+bx+a,则a=?,f+e+d+c+b=?先回答先得分
若x^2+2xy+y^2-a(x+y)+25是一个完全平方式,则a=_已知x^2-3xy+2y^2=0(xy不等于0),则x/y+y/x=?若(2x-1)^5=fx^5+ex^4+dx^3+cx^2+bx+a,则a=?,f+e+d+c+b=?先回答先得分
a=10;
2或2.5;
a=1,f=32,e=-80,d=80,c=-40,b=10,结果为2
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若x+2xy+y-a(x+y)+25是完全平方公式(步骤)
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