若x^2+2xy+y^2-a(x+y)+25是完全平方式,求a?大家帮帮忙啊~~
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若x^2+2xy+y^2-a(x+y)+25是完全平方式,求a?大家帮帮忙啊~~
若x^2+2xy+y^2-a(x+y)+25是完全平方式,求a?
大家帮帮忙啊~~
若x^2+2xy+y^2-a(x+y)+25是完全平方式,求a?大家帮帮忙啊~~
x^2+2xy+y^2-a(x+y)+25=(X+Y)^2-a(x+y)+5^2,因要是完全平方式,所以应有(X+Y)^2-a(x+y)+5^2=(X+Y+5)^2,故有a=-10
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