1.(x+1)(x+2)(x+3)(x+4)>120
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1.(x+1)(x+2)(x+3)(x+4)>120
2.x³(x²-4)+4>x²
2.x³(x²-4)+4>x²
1.
[(x+1)(X+4)][(x+2)(x+3)]>120
(x^2+5x+4)(x^2+5x+6)>120
(x^2+5x+5)^2-121>0
(x^2+5x-6)(x^2+5x+16)>0
x^2+5x+16>0
x^2+5x-6>0
X1
2.
X^5-4X^3-X^2+4>0
X^5-X^2-4(X^3-1)>0
(X^2-4)(X^3-1)>0
(x-2)(x+2)(x-1)(x^2+x+1)>0
x^2+x+1>0
(x-2)(x+2)(x-1)>0
x>2或-2
[(x+1)(X+4)][(x+2)(x+3)]>120
(x^2+5x+4)(x^2+5x+6)>120
(x^2+5x+5)^2-121>0
(x^2+5x-6)(x^2+5x+16)>0
x^2+5x+16>0
x^2+5x-6>0
X1
2.
X^5-4X^3-X^2+4>0
X^5-X^2-4(X^3-1)>0
(X^2-4)(X^3-1)>0
(x-2)(x+2)(x-1)(x^2+x+1)>0
x^2+x+1>0
(x-2)(x+2)(x-1)>0
x>2或-2
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
几道解不等式|x+1|>x|x-1|+|x-2|=7(X^2-2x+1)(x+1)^3(2-x)/[(X+4)(X^2-
x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4)
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
|x^2-3x-4|>x+1
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
解方程:1.x/x+1-1=3/(x+1)(x-2) 2.3/x+2+1/x=4/x²+2x 3.2/3+x/
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
1.求数列1,x+x^2,x^2+x^3+x^4,x^3+x^4+x^5+x^6,...前n项之和
1.(x³-4x²+4x)(3+2x-x²)>0