(y+1)÷3-(y-1)÷2≥(y-1)÷6
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
(x-2y)2n÷(2y-x)2n-1+(2x-y)(-2x-y)+(x-y)(-x+y)
先化简,再求值 (1)[(x-y)的平方+(x+y)(x-y)]÷2x 其中X=2010,y=2009 (2)y(x+y
数学题化简再求值(1/x-y+1/x+y)÷x^2 y^2/x^2-y^2,其中x=3,y=-√2
先化简再求值(x-y/1-x+y/1)÷x平方+2xy+y平方/2y,其中x=根号3+2,y=根号3
先化简,再求值:[(2x+y)²-(2x-y)(2x+y)]÷(2y),其中x=3,y=-1的答案
先化简,再求值,[(2x+y)+(y+2x)(y-2x)-2y(4x-y)]÷4y,其中x=1/2,y=1/3
已知x-y=1,求[(x+2y)2+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值.
[(2x+3y)²-(y+2x)(2x-y)-10y(x+y+1)÷2y其中x=2019,y=20
[(x²+y²)-(x-y)²+2y(x-y)]÷1/2
(1)x-y/x-2y÷x^2-y^2/x^2-4xy+4y^2