先化简:(x²+2x+1)/(x-2) ÷(x²-1)/(x-1)+1/(2-x) ,在选择一个合适的数代入求值
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先化简:(x²+2x+1)/(x-2)÷(x²-1)/(x-1)+1/(2-x),在选择一个合适的数代入求值先化简:(x²+2x+1)/(x-2)÷(x²-1)
先化简:(x²+2x+1)/(x-2) ÷(x²-1)/(x-1)+1/(2-x) ,在选择一个合适的数代入求值
先化简:(x²+2x+1)/(x-2) ÷(x²-1)/(x-1)+1/(2-x) ,在选择一个合适的数代入求值
先化简:(x²+2x+1)/(x-2) ÷(x²-1)/(x-1)+1/(2-x) ,在选择一个合适的数代入求值
(x²+2x+1)/(x-2)÷(x²-1)/(x-1)+1/(2-x)
=(x+1)²/(x-2)÷[(x+1)(x-1)]/(x-1)-1/(x-2)
=(x+1)²/(x-2)÷(x+1)-1/(x-2)
=(x+1)/(x-2)-1/(x-2)
=[(x+1)-1]/(x-2)
=x/(x-2)
当x=3时,原式=3/(3-2)=3
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