通分:a-1/a^2+2a+1,6/a^2-1解:∵a^2+2a+1=(a+1)^2 a^2-1=(a+1)(a-1)后面怎麽做?

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通分:a-1/a^2+2a+1,6/a^2-1解:∵a^2+2a+1=(a+1)^2      a^2-1=(a+1)(a-1)后面怎麽做?

通分:a-1/a^2+2a+1,6/a^2-1解:∵a^2+2a+1=(a+1)^2 a^2-1=(a+1)(a-1)后面怎麽做?
通分:a-1/a^2+2a+1,6/a^2-1
解:∵a^2+2a+1=(a+1)^2
a^2-1=(a+1)(a-1)
后面怎麽做?

通分:a-1/a^2+2a+1,6/a^2-1解:∵a^2+2a+1=(a+1)^2 a^2-1=(a+1)(a-1)后面怎麽做?
∵a^2+2a+1=(a+1)^2
a^2-1=(a+1)(a-1)
∴公分母是(a+1)^2(a-1)
a-1/a^2+2a+1
=(a-1)(a-1)/(a+1)^2(a-1)
=(a^2-1)/(a^3+a^2-a-1)
6/a^2-1
=6(a+1)/(a^2-1)(a+1)
=(6a+6)/(a^3+a^2-a-1)

a-1/a^2+2a+1=(a-1)^2/[(a+1)^2*(a-1)]
6/(a^2-1)=6*(a+1)/[(a+1)^2*(a-1)]

:∵a^2+2a+1=(a+1)^2
a^2-1=(a+1)(a-1)
∴公分母是(a+1)^2(a-1)
a-1/a^2+2a+1
=(a-1)(a-1)/(a+1)^2(a-1)
=(a^2-1)/(a^3+a^2-a-1)
6/a^2-1
=6(a+1)/(a^2-1)(a+1)
=(6a+6)/(a^3+a^2-a-1)