X+12.3-455.6等于几

X+12.3-455.6等于几 几x几等于2400. x、y等于几 X等于几? 未知数x等于几? x等于 几 x等于几? x是等于几 求x等于几 这题x等于几? x等于几Y等于几 4x-x等于几 7x*x等于几 0x等于1,x等于几 in(x+1)等于几,e^x等于几 x等于7,则x等于几 负x等于7,则x等于几 -3x>-5等于几? 1乘x等于几