(a-1)分之4+(a+2)分之2-(a-2)分之2-(a+1)分之4

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(a-1)分之4+(a+2)分之2-(a-2)分之2-(a+1)分之4

[(a-2)/a(a+2)-(a-1)/(a+2)^2]除以((a-4)/(a+2)
=(a^2-4-a^2+a)/a(a+2)^2 * (a+2)/(a-4)
=(a-4)/a(a+2)^2 * (a+2)/(a-4)
=1/a(a+2)
(a-1)^2=0
a=1…