已知(x+y)(x+y)=625/36 x-y=7/6 求xy的值?
已知(x+y)(x+y)=625/36 x-y=7/6 求xy的值?
已知(X-Y)^2=625/36,X+Y=7/6,求XY的值
已知(x-y)^2=625/36,x+y=7/6,分别求x^2-y^2,x^2+y^2,xy的值.
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
已知x+y=-5,x*x+y*y=19求xy和(x-y)*(x-y)的值
已知x+y=6,xy=7,求(3x+y)*(3x+y)+(x+3y)*(x+3y)的值
已知xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-(6x2y-2xy平方)/2y的值
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
初中数学分式已知x/y=2,求(x*x-xy+3y*y)/x*x+xy+6y*y的值