十四是十四
幼苗
共回答了19个问题采纳率:89.5% 举报
(3-x)/(2x-4)÷(x+2 - 5/x-2)
=(3-x)/2(x-2)·( (x²-9)/(x-2))
=-1/2(x+3)
(1/(x+1) + 1/(x-1))÷ x/(x+1)
=2x/(x²-1) *(x+1)/x
=2/(x-1)
1/(x+1) - (x+3)/(x²-1) ·( x²-2x+1)/(x²+4x+3)
=-4/(x²-1)·(x+1)/(x+3)
=-4/(x-1)(x+3)
=-4/(x²+2x-3)
(1/x - 1/2)÷(1- x²+4/4x )
=(2-X)/2x ÷ ( x-x^3+1)/x
=(2-x)/2( x-x^3+1)
1年前
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