求2x^2+2y^2+4y+2x+2xy+5的最小值
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已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
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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
已知x-y=4xy,求2x+3xy-2y/x-2xy-y的值
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x-y=4xy,试求2x+3xy-2y/x-2xy-y
已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值
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求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
(x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1)