x等于几Y等于几

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)(x-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? 5x乘以5y等于几 (x+2y-1)²等于几? x-20=y+20等于几? X+Y=90,X/Y=5,请问X等于几?Y等于几? 几x几等于2400. 已知x减y等于负二;x加y等于1,问x等于几,y等于几. 如果x等于负x那么y等于几