(a²-b²)/(a-b)=(a³-b³)/(a-b)=

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(a²-b²)/(a-b)=(a³-b³)/(a-b)=
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(a²-b²)/(a-b)=(a³-b³)/(a-b)=
(a²-b²)/(a-b)=
(a³-b³)/(a-b)=

(a²-b²)/(a-b)=(a³-b³)/(a-b)=
(a²-b²)/(a-b)=(a+b)
(a³-b³)/(a-b)=a²+ab+b²

a+b(a不等于b)

(a²-b²)/(a-b)= a+b
(a³-b³)/(a-b)=a²+ab+b²

1.a+b
2.a²+ab+b²