数学题初三 求解答 要过程 2个
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解:(1)2015-pai/=0
x^0=1(x/=0)
=1+3-(3^1/2-2)0-3x3^1/2/3+6x3^1/2/3
=4-3^1/2+2-3^1/2+2x3^1/2
=6-2x3^1/2+2x3^1/2
=6
(2)a/(a+2)^2+(a^2-4-2a+4)/(a^2-4)
=a/(a+2)^2+(a^2-2a)/(a+2)(a-2)
=a/(a+2)^2+a(a-2)/(a+2)(a-2)
=a/(a+2)^2+a/(a+2)
=(a+a^2+2a)/(a+2)^2
=(a^2+3a)/(a+2)^2
=a(a+3)/(a+2)^2
=(3^1/2-2)x(3^1/2-2+3)/(3^1/2)^2
=(3^1/2-2)(3^1/2+1)/3=(1-3^1/2)/3
x^0=1(x/=0)
=1+3-(3^1/2-2)0-3x3^1/2/3+6x3^1/2/3
=4-3^1/2+2-3^1/2+2x3^1/2
=6-2x3^1/2+2x3^1/2
=6
(2)a/(a+2)^2+(a^2-4-2a+4)/(a^2-4)
=a/(a+2)^2+(a^2-2a)/(a+2)(a-2)
=a/(a+2)^2+a(a-2)/(a+2)(a-2)
=a/(a+2)^2+a/(a+2)
=(a+a^2+2a)/(a+2)^2
=(a^2+3a)/(a+2)^2
=a(a+3)/(a+2)^2
=(3^1/2-2)x(3^1/2-2+3)/(3^1/2)^2
=(3^1/2-2)(3^1/2+1)/3=(1-3^1/2)/3
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