数学计算题,求过程 谢谢
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(1) (a-1)/(a+1)-1/a=a(a-1)/a(a+1)-(a+1)/a(a+1)
=(a^2-a-a-1)/a(a+1)
=(a^2-2a-1)/a(a+1).
(2) (x-3)/吵喊(x^2+6x+9)+x/升轮野(9-x^2)
=(x-3)/桐念(x+3)^2-x/(x+3)(x-3)
=[(x-3)^2-x(x+3)]/(x+3)^2(x-3)
=(x^2-6x+9-x^2-3x)/(x+3)^2(x-3)
=(-9x+9)/(x+3)^2(x-3).
=(a^2-a-a-1)/a(a+1)
=(a^2-2a-1)/a(a+1).
(2) (x-3)/吵喊(x^2+6x+9)+x/升轮野(9-x^2)
=(x-3)/桐念(x+3)^2-x/(x+3)(x-3)
=[(x-3)^2-x(x+3)]/(x+3)^2(x-3)
=(x^2-6x+9-x^2-3x)/(x+3)^2(x-3)
=(-9x+9)/(x+3)^2(x-3).
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