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原式=1/(x+1)+(x-3)/(x-3)²×(x-3)/x(x+1)
=1/(x+1)+1/(x-3)×(x-3)/x(x+1)
=x/x(x+1)+1/x(x+1)
=(x+1)/x(x+1)
=1/x
=1/(-3/2)
=-2/3
=1/(x+1)+1/(x-3)×(x-3)/x(x+1)
=x/x(x+1)+1/x(x+1)
=(x+1)/x(x+1)
=1/x
=1/(-3/2)
=-2/3
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