已知3次根号8-x²=8-x²,求x的值._数学解答

已知3次根号8-x²=8-x²,求x的值.

人气：493 ℃　时间：2019-10-19 23:38:57

解答

³√(8-x²)=8-x²8-x²=(8-x²)³(x²-8)³-(x²-8)=0(x²-8)[(x²-8)²-1]=0(x²-8)(x²-8+1)(x²-8-1)=0(x²-8)(x²-7)(x²-9)=0(x+2...