(x2+6x+8)(x2+14x+48)+12
因式分解(x2-x)(x2-x-8)+12
因式分解:(x2+8x+12)(x2+8x+10)
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
解不等式:(3x2-14x+14)/(x2-6x+8)≥1
1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=1/(x+4)
(x2+3x+9)/(x2-27)+(6x)/(9x-x2)-(x-1)/(6+2x)
x1+x2=8 /x1-x2/ x /c/=6 x1,x2,c 为整数
解方程:X2--1/8(X2+2X)+X2+2X/3(X2--1)=11
x4+y2x2+y4 x3+x2y-xy2-y3 (x2+x)-8(x2+x)+12 因式分解,x2表示x的两次
已知函f(x)=x2-8lnx,g(x)=-x2+14x
先化解,再求值:【1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)】/1/(x2+9x+20),
1/(x2+x)+1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=4/21