1.化简:4/(x^2-16)除以2/(x-4)+x/(x+4)2.计算{a+2/(a^2-2a)+8/(4-a^2)}除以a-2/a
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1.化简:4/(x^2-16)除以2/(x-4)+x/(x+4)2.计算{a+2/(a^2-2a)+8/(4-a^2)}除以a-2/a
1.化简:4/(x^2-16)除以2/(x-4)+x/(x+4)
2.计算{a+2/(a^2-2a)+8/(4-a^2)}除以a-2/a
1.化简:4/(x^2-16)除以2/(x-4)+x/(x+4)2.计算{a+2/(a^2-2a)+8/(4-a^2)}除以a-2/a
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1.化简:4/(x^2-16)除以2/(x-4)+x/(x+4)
=4/(x+4)(x-4)×(x-4)/2+x/(x+4)
=2/(x+4)+x/(x+4)
=(x+2)/(x+4)
迷心咒H
2.计算{a+2/(a^2-2a)+8/(4-a^2)}除以a-2/a
=a²/(a-2)+2/(a-2)²-8a/(a+2)(a-2)²
=(a²(a+2)(a-2)+2(a+2)-8a)/(a+2)(a-2)²
=(a^4-4a^2-6a+2)/(a+2)(a-2)^2;
如果本题有什么不明白可以追问,
(a+2/a^2-2a+8/4-a^2)除以a-2/a
=【(a+2)/a(a-2)-8/(a+2)(a-2)】×a/(a-2)
=【(a+2)²/a(a-2)(a+2)-8a/a(a+2)(a-2)】×a/(a-2)
=【(a²+4a+4)-8a】/a(a-2)(a+2)】×a/(a-2)
=【(a²-4a+4)】/a(a-2)(a+...
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(a+2/a^2-2a+8/4-a^2)除以a-2/a
=【(a+2)/a(a-2)-8/(a+2)(a-2)】×a/(a-2)
=【(a+2)²/a(a-2)(a+2)-8a/a(a+2)(a-2)】×a/(a-2)
=【(a²+4a+4)-8a】/a(a-2)(a+2)】×a/(a-2)
=【(a²-4a+4)】/a(a-2)(a+2)】×a/(a-2)
=【(a-2)²】/a(a-2)(a+2)】×a/(a-2)
=【(a-2)】/a(a+2)】×a/(a-2)
=1/(a+2)
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