已知3次根号8-x²=8-x²,求x的值.

问题描述:

已知3次根号8-x²=8-x²,求x的值.

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...