求详细过程,算出结果,谢谢!
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(2n+2)/(n+3)-2n/(n+2)
=(2n+2)(n+2)/(n+3)(n+2)-2n(n+3)/(n+2)(n+3)
=(2n²+4n+2n+4)/(n²+2n+3n+6)-(2n²+6n)/(n²+3n+2n+6)
=(2n²+6n+4)/(n²+5n+6)-(2n²+6n)/(n²+5n+6)
=[(2n²+6n+4)-(2n²+6n)]/(n²+5n+6)
=(2n²+6n+4-2n²-6n)/(n²+5n+6)
=4/((n²+5n+6)
=(2n+2)(n+2)/(n+3)(n+2)-2n(n+3)/(n+2)(n+3)
=(2n²+4n+2n+4)/(n²+2n+3n+6)-(2n²+6n)/(n²+3n+2n+6)
=(2n²+6n+4)/(n²+5n+6)-(2n²+6n)/(n²+5n+6)
=[(2n²+6n+4)-(2n²+6n)]/(n²+5n+6)
=(2n²+6n+4-2n²-6n)/(n²+5n+6)
=4/((n²+5n+6)
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