(-x+y)(x-y)等于几

x、y等于几 (-x+y)(x-y)等于几 x等于几Y等于几 x乘以y等于几 X加Y等于几 (X+Y)^2等于几 X+Y等于几呵呵? x加y等于几? x和y等于几 X+Y=90,X/Y=5,请问X等于几?Y等于几? ：x除以2y等于100x x等于几? 已知x加x加y等于十五,x加y等于9,x等于几?y等于几? (x+y)(x²-xy+y²)等于几啊 x+3=5-y,那么x+y等于几 (x-y)平方-(y-x)立方等于几?分解因式 (3x-5y)-(3x-2y)等于几 y*y*y*y+2x*x*x*x=4x*x*y 求x等于几,y等于几,写出所有选项! x+x+x=15,x+y+y=19,求y-x等于几