Mathematics
Senior High
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CON
数
い
(8)
ƒ(b) — ƒ(a) _ (−26³ +6²)-(-2a³+ a²)
b-a
b-a
-2(6³-a³)+(b²-a²)
b-a
(b-a){-2(b²+ba+a²)+(b+a)}
b-a
=-2a²-2ab-2b²+a+b
7
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