⒈若X^2+Xy-2y^2=0则(X^2+3Xy+y^2)/X^2+y^2=?⒉若根号-a—b—2又根号ab=根号-b—根号-a则ab关系?⒊1/1+根号2+1/根号2+根号3+1/根号3+根号4+1/根号4+根号5+1/根号5+根号6=?⒋3^2+4xy-y^2怎么解?
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![⒈若X^2+Xy-2y^2=0则(X^2+3Xy+y^2)/X^2+y^2=?⒉若根号-a—b—2又根号ab=根号-b—根号-a则ab关系?⒊1/1+根号2+1/根号2+根号3+1/根号3+根号4+1/根号4+根号5+1/根号5+根号6=?⒋3^2+4xy-y^2怎么解?](/uploads/image/z/7584965-53-5.jpg?t=%E2%92%88%E8%8B%A5X%5E2%2BXy-2y%5E2%3D0%E5%88%99%28X%5E2%2B3Xy%2By%5E2%29%2FX%5E2%2By%5E2%3D%3F%E2%92%89%E8%8B%A5%E6%A0%B9%E5%8F%B7-a%E2%80%94b%E2%80%942%E5%8F%88%E6%A0%B9%E5%8F%B7ab%3D%E6%A0%B9%E5%8F%B7-b%E2%80%94%E6%A0%B9%E5%8F%B7-a%E5%88%99ab%E5%85%B3%E7%B3%BB%3F%E2%92%8A1%2F1%2B%E6%A0%B9%E5%8F%B72%2B1%2F%E6%A0%B9%E5%8F%B72%2B%E6%A0%B9%E5%8F%B73%2B1%2F%E6%A0%B9%E5%8F%B73%2B%E6%A0%B9%E5%8F%B74%2B1%2F%E6%A0%B9%E5%8F%B74%2B%E6%A0%B9%E5%8F%B75%2B1%2F%E6%A0%B9%E5%8F%B75%2B%E6%A0%B9%E5%8F%B76%3D%3F%E2%92%8B3%5E2%2B4xy-y%5E2%E6%80%8E%E4%B9%88%E8%A7%A3%3F)
⒈若X^2+Xy-2y^2=0则(X^2+3Xy+y^2)/X^2+y^2=?⒉若根号-a—b—2又根号ab=根号-b—根号-a则ab关系?⒊1/1+根号2+1/根号2+根号3+1/根号3+根号4+1/根号4+根号5+1/根号5+根号6=?⒋3^2+4xy-y^2怎么解?
⒈若X^2+Xy-2y^2=0则(X^2+3Xy+y^2)/X^2+y^2=?
⒉若根号-a—b—2又根号ab=根号-b—根号-a则ab关系?
⒊1/1+根号2+1/根号2+根号3+1/根号3+根号4+1/根号4+根号5+1/根号5+根号6=?
⒋3^2+4xy-y^2怎么解?
⒈若X^2+Xy-2y^2=0则(X^2+3Xy+y^2)/X^2+y^2=?⒉若根号-a—b—2又根号ab=根号-b—根号-a则ab关系?⒊1/1+根号2+1/根号2+根号3+1/根号3+根号4+1/根号4+根号5+1/根号5+根号6=?⒋3^2+4xy-y^2怎么解?
1,根据条件可得到X^2-Y^2=Y^2-XY就有(X+Y)(X-Y)=Y(Y-X)
那么:就有X=Y或者Y=-2X 故可得答案
2,3,看不懂题,你下个数学符号编辑器.
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若实数x,y满足x^2-xy-y^2 =0,则x/y=?
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若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若xy/x+y=2,则3x-xy+3y/-x+3xy-y=
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若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
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