高手帮忙解几道一元二次方程(4x+3)(5-x)=0(x-1)^2+2x(x-1...
高手帮忙解几道一元二次方程(4x+3)(5-x)=0(x-1)^2+2x(x-1)=02x^2-4x-5=0-3x^2-4x+4=03x(x-1)=2-2x(x-1)(x...
高手帮忙解几道一元二次方程 (4x+3)(5-x)=0 (x-1)^2+2x(x-1)=0 2x^2-4x-5=0 -3x^2-4x+4=0 3x(x-1)=2-2x (x-1)(x+2)=70 x(x+6)=7 (3-x)^2+x^2=9
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1.(4x+3)(5-x)=0
x1=-3/4,x=52.(x-1)^2+2x(x-1)=0
(x-1)(x-1+2x)=0(x-1)(3x-1)=0x1=1,x2=1/33.2x^2-4x-5=0套万能公式x1=(2+根下14)/2,x2=(2-根下14)/2
4.-3x^2-4x+4=0十字相乘法(-3x+2)(x+2)=0x1=2/3,x2=-2
5.3x(x-1)=2-2x3x(x-1)+2(x-1)=0(x-1)(3x+2)=0x1=1,x2=-2/3
6.(x-1)(x+2)=70x^2+x-72=0（x-8)(x+9)=0x1=8,x2=-97.x(x+6)=7
x^2+6x-7=0(x+7)(x-1)=0x1=-7,x2=18.(3-x)^2+x^2=99-6x+x^2+x^2=92x^2-6x=02x(x-3)=0x1=0,x2=3
x1=-3/4,x=52.(x-1)^2+2x(x-1)=0
(x-1)(x-1+2x)=0(x-1)(3x-1)=0x1=1,x2=1/33.2x^2-4x-5=0套万能公式x1=(2+根下14)/2,x2=(2-根下14)/2
4.-3x^2-4x+4=0十字相乘法(-3x+2)(x+2)=0x1=2/3,x2=-2
5.3x(x-1)=2-2x3x(x-1)+2(x-1)=0(x-1)(3x+2)=0x1=1,x2=-2/3
6.(x-1)(x+2)=70x^2+x-72=0（x-8)(x+9)=0x1=8,x2=-97.x(x+6)=7
x^2+6x-7=0(x+7)(x-1)=0x1=-7,x2=18.(3-x)^2+x^2=99-6x+x^2+x^2=92x^2-6x=02x(x-3)=0x1=0,x2=3
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