求证：（1）x^2+5x+6(x-2)(x-4)(3)x^2+y^2+1>2(x+y-1)

*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 求证：（1）x^2+5x+6(x-2)(x-4)(3)x^2+y^2+1>2(x+y-1) 解九宫格题目（X为未知数）9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1 求证不等式:x-x^2 求证：（X的平方-4X+2）(X的平方-4X+5)+2能分别被X-1,X-2,X-3整除 求证：多项式（x-1)(x-2)(x-3)(x-4)-(x^2-5x)^2-10(x^2-5x)的值与x的取值无关 求证X+3为X^3+2X^2-5X-6的因式 求证lim x→∞ √x^2+1-√x^-2x+5 =1 求证：2(根号x)>3-(1/x) (x>1) 求证：tan x/2=sin x/(1+cos x) 求证：1-sin(x)=cos(x)*tan(x/2) 求证(x^2-9)(x-7)(x-1) 求证:f（x）=x^3-9x^2+15x-1在（1,5）上是减函数. x^6-x^5+x^4-x^2+x-1 求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X 计算（x*x+4x+5）/（x+2）-（x*x+6x+10）/（x+3）+1 求证：（x+4）(x+3)(x+2)(x+1)与(x-1)（x-2）(x-3)(x-4)-120有相同的因式