关于一元二次方的算术题3x²+4x-4=0用配方做.2x-4x-1=0（同上）1/4x²-6x+3=0（同上）
2020-04-29
关于一元二次方的算术题
3x²+4x-4=0用配方做.
2x-4x-1=0（同上）
1/4x²-6x+3=0（同上）
优质解答
3x^2+4x-4=03(x^2+4/3x)-4=03(x+2/3)^2-4-4/3=03(x+2/3)^2=16/3(x+2/3)^2=16/9x+2/3=4/3或x+2/3=-4/3x1=2/3,x2=-22x^2-4x-1=02(x-1)^2=3(x-1)^2=3/2x-1=√6/2或x-1=-√6/2x1=1+√6/2,x2=1-√6/21/4x^2-6x+3=0x^2-24x...
3x^2+4x-4=03(x^2+4/3x)-4=03(x+2/3)^2-4-4/3=03(x+2/3)^2=16/3(x+2/3)^2=16/9x+2/3=4/3或x+2/3=-4/3x1=2/3,x2=-22x^2-4x-1=02(x-1)^2=3(x-1)^2=3/2x-1=√6/2或x-1=-√6/2x1=1+√6/2,x2=1-√6/21/4x^2-6x+3=0x^2-24x...