已知y-2x=10,求[2y(x-y)-(x-y)2+(x+y)2-2xy]÷4y的值.
已知y-2x=10,求[2y(x-y)-(x-y)2+(x+y)2-2xy]÷4y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=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y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x^2+xy-2y^2=0 (x不等于0,y不等于0),求x/y-y/x-(x^2+y^2)/xy的值
初中数学分式已知x/y=2,求(x*x-xy+3y*y)/x*x+xy+6y*y的值
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
已知;x+y=4,x-y的绝对值=6,求xy(y的平方+y)-y的平方(xy+2x)-3xy
已知x-y=-2/3,求(x·x+y.y)的完全平方-4xy(x·x+y·y)+4x·x·y·y的值
已知x+y=6,xy=-2,求(x^4-y^4)除以x^2+y^2/xy乘以(6x+6y)的值.
正数x,y满足x^2-y^2=2xy,求(x-y)/(x+y)的值
已知2x-y=10,求((x+y)-(x-y)+2y(x-y))÷4y的值