(x-3)²=21计算？
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=(x-3)/(x+1)(x-1)-2(x-1)/(x+1)(x-1)
=(x-3-2x+2)/(x+1)(x-1)
=(-x-1)/(x+1)(x-1)
=-(x+1)/(x+1)(x-1)
=-1/(x-1)
=1/(1-x)
=(x-3-2x+2)/(x+1)(x-1)
=(-x-1)/(x+1)(x-1)
=-(x+1)/(x+1)(x-1)
=-1/(x-1)
=1/(1-x)
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展开全部
=(x-3)/(x+1)(x-1)-2(x-1)/(x+1)(x-1)
=(x-3-2x+2)/(x+1)(x-1)
=(-x-1)/(x+1)(x-1)
=-(x+1)/(x+1)(x-1)
=-1/(x-1)
=1/(1-x)
=(x-3-2x+2)/(x+1)(x-1)
=(-x-1)/(x+1)(x-1)
=-(x+1)/(x+1)(x-1)
=-1/(x-1)
=1/(1-x)
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展开全部
=(x-3)/(x+1)(x-1)-2(x-1)/(x+1)(x-1)
=(x-3-2x+2)/(x+1)(x-1)
=(-x-1)/(x+1)(x-1)
=-(x+1)/(x+1)(x-1)
=-1/(x-1)
=1/(1-x)
=(x-3-2x+2)/(x+1)(x-1)
=(-x-1)/(x+1)(x-1)
=-(x+1)/(x+1)(x-1)
=-1/(x-1)
=1/(1-x)
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=(x-3)/(x+1)(x-1)-2(x-1)/(x+1)(x-1)
=(x-3-2x+2)/(x+1)(x-1)
=(-x-1)/(x+1)(x-1)
=-(x+1)/(x+1)(x-1)
=-1/(x-1)
=1/(1-x)
=(x-3-2x+2)/(x+1)(x-1)
=(-x-1)/(x+1)(x-1)
=-(x+1)/(x+1)(x-1)
=-1/(x-1)
=1/(1-x)
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(x-3)²=21计算方法
x-3=±√21
x1=√21+3
x2=-√21+3
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