2(x-1)²-8=0 ,x²-8x-2=0,x²-6=7x,2x²-6x+1=0,3x&_数学解答

2(x-1)²-8=0 ,x²-8x-2=0,x²-6=7x,2x²-6x+1=0,3x²+8x-2=0.

人气：363 ℃　时间：2019-10-31 11:57:04

解答

2(x-1)²-8=0 ,(x-1)²-4=0 (x-1-2)(x-1+2)=0(x-3)(x+1)=0x=3或x=-1x²-8x-2=0,x²-8x+16-16-2=0(x-4)²-18=0(x-4-3√2)(x-4+3√2)=0x=4+3√2或x=4-3√2x²-6=7x,x²-7x-6=0x²-7x+...