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2x^2+6x+2=0 解方程

x2-6x+2=0移项,得x2-6x=-2,即x2-6x+9=-2+9,∴(x-3)2=7,解得x-3=±7,即x=3±7.∴x1=3+7,x2=3-7.

解法1:∵a=2,b=-6,c=3∴x=6±122×2∴x1=3+32,x2=3?32;解法2:x2-3x+3=?32x2-3x+94=?32+94(x?32)2=34x?32=±34∴x1=3+32,x2=3?32.

6x^2+19x+10=0 (2x+5)(3x+2)=0 2x+5=0或3x+2=0 x1=-5/2,x2=-2/3 十字相乘法的方法简单来讲就是:十字左边相乘等于二次项系数,右边相乘等于常数项,交叉相乘再相加等于一次项系数。 如x^2+(m+n)x+mn=(x+m)(x+n) x^2+x-2=(x+2)(x-1).

x^2-6x-27=0 (x+3)(x-9)=0 x=-3或x=9 望采纳,谢谢

(2x^2-12)/(x^2-5)=2-2/(x^2-5)=(2x^2+6x-24)/(x^2+3x-11)=2-2/(x^2+3x-11) 所以:x^2-5=x^2+3x-11 3x=6 x=2

(1)由原方程,得(x-7)(x+1)=0,所以,x-7=0,或x+1=0,解得,x1=7,x2=-1;(2)由原方程,得(2x+1)(x+2)=0,所以,2x+1=0,或x+2=0,解得,x1=-12,x2=-2.

用配方法 x²+6x-1=0 x²+6x-1+10=10 x²+6x+9=10 (x+3)²=10 x+3=±√10 x=±√10-3 即 x=√10-3或x=-√10-3

x²-6X-6-x根号x²-2x-2=0 根号x²-2x-2=(x²-6X-6)/x=(x-6-6/x) 两边平方得 x²-2x-2=(x-6)^2-12(x-6)/x+36/x^2 x²-2x-2=x^2-12x+(36-12)+72/x+36/x^2 10x-26=72/x+36/x^2 5x-13=36/x+18/x^2 5x^3-13x^2=36x+18 5x^3-...

(1)x2-6x+3=0a=1,b=-6,c=3b2-4ac=24>0所以x1=3+6,x2=3-6;(2)x2-2x-3=0x2-2x=3x2-2x+1=4(x-1)2=4x-1=±2∴x1=3,x2=-1.(3)(x-2)(x-3)-(x-2)=0,∴(x-2)(x-3-1)=0,∴x-2=0或x-3-1=0,∴x1=2,x2=4.

左==(6x^4 - 24x^3 + 24x^2) - x^3 - 12x^2 + 25x + 6 =6x^2*(x - 2)^2 - x^3 + 4x^2 - 4x - 16x^2 + 29x + 6 =6x^2*(x - 2)^2 - x(x^2 - 4x + 4) - (16x^2 - 29x - 6) =6x^2*(x - 2)^2 - x(x - 2)^2 - (x - 2)(16x + 3) =(x - 2)[6x^2*(x - 2) ...

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