[(6-5x+x^2)/(x^2-16)]/[(x-3)/(4-x)]*[(x^2+5x+4)/(4-x^2)]急,一道算术

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[(6-5x+x^2)/(x^2-16)]/[(x-3)/(4-x)]*[(x^2+5x+4)/(4-x^2)]急,一道算术
[(6-5x+x^2)/(x^2-16)]/[(x-3)/(4-x)]*[(x^2+5x+4)/(4-x^2)]
急,一道算术

[(6-5x+x^2)/(x^2-16)]/[(x-3)/(4-x)]*[(x^2+5x+4)/(4-x^2)]急,一道算术
[(6-5x+x^2)/(x^2-16)]/[(x-3)/(4-x)]*[(x^2+5x+4)/(4-x^2)]
=(x-2)(x-3)/(x-4)(x+4)*(4-x)/(x-3)*(x+1)(x+4)/(2+x)(2-x)
=(x+1)/(x+2)

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