a的三次方*(b-c) b的三次方(c-a) c的三次方(a-b)

2025-05-14 14:38:00
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回答(1):

解: (a-b-c)³ =(a-b-c)²(a-b-c) =[(a-b)²-2c(a-b)+c²](a-b-c) =(a²-2ab+b²-2ac+2bc+c²)(a-b-c) =a³-a²b-a²c-2a²b+2ab²+2abc+ab²-b³-b²c-2a²c+2abc+2ac²
三次方,b-c,a-b
解: (a-b-c)³ =(a-b-c)²(a-b-c) =[(a-b)²-2c(a-b)+c²](a-b-c) =(a²-2ab+b²-2ac+2bc+c²)(a-b-c) =a³-a²b-a²c-2a²b+2ab²+2abc+ab²-b³-b²c-2a²c+2abc+2ac²