求解答(x- x/x²-1)/(2+1/x-1 - 1/x+1)
问题描述:
求解答(x- x/x²-1)/(2+1/x-1 - 1/x+1)
答
他瘦而黑,像一根铁钉 本体和喻体之间的相似之处是
答
原式=(x³-x-x)/(x+1)(x-1)÷(2x²-2+x+1-x+1)/(x+1)(x-1)=(x³-2x)/(x+1)(x-1)×(x+1)(x-1)/2x²=x(x²-2)/(x+1)(x-1)×(x+1)(x-1)/2x²=(x²-2)/2x