(x+y)²+6(x+y)+9 a²-2a(b+c)+(b+c)² 4xy-4x²y-y³ -a+2
(x+y)²+6(x+y)+9a²-2a(b+c)+(b+c)²4xy-4x²y-y³-a+2a²-a...
(x+y)²+6(x+y)+9
a²-2a(b+c)+(b+c)²
4xy-4x²y-y³
-a+2a²-a³ 展开
a²-2a(b+c)+(b+c)²
4xy-4x²y-y³
-a+2a²-a³ 展开
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