作业帮先化简,再求值 x+3/x2-1 ÷(x+3)(x-1)/x2-2x+1,其中x=2007,
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先化简,再求值 x+3/x2-1 ÷(x+3)(x-1)/x2-2x+1,其中x=2007,
先化简,再求值 x+3/x2-1 ÷(x+3)(x-1)/x2-2x+1,其中x=2007,
先化简,再求值 x+3/x2-1 ÷(x+3)(x-1)/x2-2x+1,其中x=2007,
(x+3)/(x²-1) ÷(x+3)(x-1)/(x²-2x+1)
=(x+3)/(x-1)(x+1) ÷(x+3)(x-1)/(x-1)²
=(x+3)/(x-1)(x+1) ÷(x+3)/(x-1)
=(x+3)/(x-1)(x+1) ×(x-1)/(x+3)
=1/(x+1)
=1/(1+2007)
=1/2008
有很多种的~