若x-y-2√x+y+4是x+y+4的算术平方根,其值为6,求x、y的值 Thank you very much

若X,Y是整数,求证:(x+y)(x+2y)(x+3y)(x+4y)+y的四次方是一个完全平方数急 THANKS! 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 {(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y RT,若（√2x-y）+y^2+4y+4=0,求[(x-y)^2+(x+y)(x-y)]÷2x的值 先化简再求值{(x-y)(x+y)-(x+y)(x-2y)}/y 其中xy的值是代数式{(3x-2y-7)^2+|2x+3y先化简再求值{(x-y)(x+y)-(x+y)(x-2y)}/y 其中x和y的值是代数式{(3x-2y-7)^2+|2x+3y+4|}^0无意义 若|x-3|+（y+2）=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 若|x-3|+（y+2）²=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 若实数x,y满足不等式组｛x+y≥2 ｛2x-y≤4 ｛x-y≥0 ,则2x+3y的最小值是? 若x+y=4,则多项式1/2(x+y)+4(x-y)-3（x-y）-3/2(x+y)-x+y值是（） 若x-y-2√x+y+4是x+y+4的算术平方根,其值为6,求x、y的值 Thank you very much 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? 若x=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值? 若X-Y分之X+2Y等于2,则代数式X-Y分之2（X+2Y)-X+2Y分之4（X-Y)的值为 若X=负四分之一,能否确定代数式(2X-Y)(2X+Y)+(2X-Y)(Y-4X)+2Y(Y-3X)的值? y=4x+1,y=2x²,y=-√5x,y=√x中y是正比例函数的是哪一个? [(x+y)^3]^6-3[(x+y)^3]^6X(x+y)^4X(-x-y)^2大写的X是乘号 小写的x是字母 [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y 4x(2y-y)与2y(y-2x)的公因式是