X^2+3X+6=0

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6x-2x+3x-3x-x=1.2×3 多项式x^4+2x^3-4x^2-2x+3与x^3+4x^2+x-6的最大公因式是什么x^4+2x^3-4x^2-2x+3=(x^4+3x^3)-x(x^2+4x+3)+(x+3)=x^3(x+3)-x(x+1)(x+3)+(x+3)=(x+3)[x^3-x(x+1)+1]=(x+3)[x^3+1-x(x+1)]=(x+3)[(x+1)( 已知x²-3x+2=0,求x²-3x和6x-2x²的值 X^2+3X+6=0 6-2x+3x-3x-x=1.2×3 4x-2=3x+1 -x+3=10 x-7=11-x x=四分之一x+6 x²+2x/x²-6x+9÷x²-4/x²-3x , 7×【2x-3】+15=2x-5 x=?3x-5=2×【2x-4】 x=?6x【x-2】-10=5×【x+8】 x=? 8x-5.5x=7.57.2x÷3.6=2 3x+6x-8x=0.7 12x-2x-5x=4.512x-x=0 5x+x=1.8 3.2x+1.8x=64.8x-0.8x=6 6.3-0.3x=9.6 8.6x-8.5x=0.720x-2x=36 9x+6x=4.5 18x-12x=5.42x-1.6x=3.6 18x+3x=7×6 1.2x-0.5x=0.71.3x+2.7x=1 4x-3.2x=6.4 0.8x+3.2x+3x=562.8x-2x=7.2 x(x-3)+2x-6=0 用因式分解法解下列方程(过程):x²-2x=0 (x+3)(x+2)=6用因式分解法解下列方程(过程):x²-2x=0 (x+3)(x+2)=6 3(x-2)=5x(2-x) (5x-1)²=2 已知x-3x+1=0,计算2x-3x-7x+2009 高中数学难题log2 (x^12+3x^10+5x^8+3x^6+1) <1+log2 (x^4+1)log2 (x^12+3x^10+5x^8+3x^6+1) <1+log2 (x^4+1) log2 (x^12+3x^10+5x^8+3x^6+1) <log2 (2x^4+2) x^12+3x^10+5x^8+3x^6+1 <2x^4+2 x^12+3x^10+5x^8+3x^6 - 2x^4 -1 < 0 (x^8 + 2x^6 + 4x 集合A={x|x2-6x+8=0},B={x|(x-a)(x-3a) 解方程6^x+4^x=9^x,9^(-x)-2*3^(1-x)=27 4x²-4x+1=x²+6x+93x²-10x-8=0(3x+2)*(x-4)=03x+2=0,x-4=0得x=-2/3 ,X=4 *-----------------------------------------------*| 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 || f(x)=x/(1+x) x>=0 f1(X)=f(X) fn(X)=fn-1[fn-1(x)]求fn(x)证明:f1(X)+2f2(X)+3f3(x)+……+nfn(X)