x、y等于几 

：x除以2y等于100x x等于几? (x+2y-1)²等于几? 已知x加y等于5,X等于几,Y等于几 已知x减y等于负二;x加y等于1,问x等于几,y等于几. (x-y)平方-(y-x)立方等于几? x+3=5-y,那么x+y等于几 (3x-5y)-(3x-2y)等于几 xy+x-y=18,x,y各等于几 x加y等于几?x加y等于几在数学题中怎么解 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 2x等于5y,2z等于3y求3x等于几z