已知x=根号2-1,则根号(x³+2x²-x+8﹚=?求大神,求详细过程,
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已知x=根号2-1,则根号(x³+2x²-x+8﹚=?求大神,求详细过程,
已知x=根号2-1,则根号(x³+2x²-x+8﹚=?
求大神,求详细过程,
已知x=根号2-1,则根号(x³+2x²-x+8﹚=?求大神,求详细过程,
原式=√x³+2x²+x-2x+8
=√x(x²+2x+1)-2x+8
=√x(√2-1+1)²-2x+8
=√2x-2x+8
=2√2