(2X+Y+1)(2X+Y-1) X为X,x为乘号快,急用!

(2X+Y+1)(2X+Y-1) X为X,x为乘号快,急用! [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y (x/x+y-x/y-x-2xy/x.x-y.y)/(1/x-1/y) 分式化简 1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) (x-y)(2x-y-1) 简化|x-y+1|-2|y-x-3|+|y-x|+5其中y为负数,x为正数 x为正数,y为负数,去绝对值号,/x-y+1/-2/y-x-3/+/y-x/+5 y=(x-1/x)/2反函数为y=x+(x^2+1)^0.5 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 x+y=1 则x^2/(x+2)+y^2/(y+1)最小值为? 已知X+Y=4018,X—Y=1/2,则-X*X+Y*Y的值为? 已知y=x-1,则代数式(x-y)2+y-x+1的值为 log4(x+2y)+log4(x-2y)=1,则|x|+|y|的最小值为 x,y为实数,证明x*2-xy+y*2>=x+y-1 若x+2y=1(x、y属于正整数)x+y的最小值为?