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分类: 作业答案 • 2022-03-10 14:37:10

问题描述：

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1.用因式分解法做.
(1)3x(x-1)+x-1=0
(2)(x-1)(x+3)=12
2.试写出一个以-1和2为两根的一元二次方程.

答

（1）3x(x-1)+x-1=0(3x+1)(x-1)=03x+1=0或x-1=0x=-1/3或x=1（2）(x-1)(x+3)=12x²+2x-3=12x²+2x-15=0(x+5)(x-3)=0x+5=0或x-3=0x=-5或x=3（3）设所求方程是x²+px+q=0由韦达定理得-1+2=-p,-1×2=q求得,p...

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