1+2+3+4+x+98+99 x等于几

1+2+3+4+x+98+99 x等于几 x-3分之2-4x+1分之5=1 等于几x等于几 4-3x等于x+1 x等于几 (x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几? 3分之1等于2x-1 x等于几 2分之3x-1等于5分之4x加2-1 x等于几 x+1除以x-1等于3,x等于几? X^2-4X=1,那么x^3-x^-3等于几?正确答案等于322,怎么算 2x加3x等于30 x等于几 1+X+X^2+X^3+X^4=0,则1+X+X^2+X^3+X^4+X^5+X^6+……+X^99等于几 3x*4x等于几 2x+1x等于几 2[4/3x-(2/3x-2/1)]=3/4x等于几 x-3分之2-4x+1分之5=1 x 等于几 (X^n-1)^2(-3^3)(-X^n)等于几? 4-3(2-x)=5x 等于几 4x-x等于几 0x等于1,x等于几