Question

a加二分之a减二加a的平方减四分之四a的和除以a的平方减四分之一

Answer 1

[(a+2)分之(a-2)+(a²-4)分之4a²]÷(a²-4)分之1
=[(a+2)(a-2)分之(a-2)²-(a+2)(a-2)分之4a²]×(a+2)(a-2)
=(a-2)²-4a²
=a²-4a+4-4a²
=-3a²-4a+4

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Answer 2

[(a-2)/(a+2)+4a/(a²-4)]÷1/(a²-4)
=[(a-2)/(a+2)+4a/(a²-4)]×(a²-4)
=(a-2)²+4a
=a²-4a+4+4a
=a²+4

Answer 3

(a+(1/2 a-2+a2-4/4 a))/(a2-1/4)
=(a+a2-1/2 a)/((a-1/2)(a+1/2))
=(a2-1/2 a)/((a-1/2)(a+1/2))
=(a(a-1/2))/((a-1/2)(a+1/2))
=a/(a+1/2)

Answer 4

(a+a/2-2+a^2-4a/4)÷a^2-1/4
=(a/2-2+a^2)÷a^2-1/4
=1/2a-2/a^2+1-1/4
=1/2a-2/a^2+3/4

Answer 5

你这样写看不懂，请用数学符号表达！