(-1)^3+3(-1)^2+3(-1)+1
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(-1)^3+3(-1)^2+3(-1)+1=-1+3×1-3+1=-1+3-3+1=0
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( -1 )³ + 3 ( -1 )² + 3 ( -1 ) +1
as ( -1 ) ³ = -1 , ( -1 )² = 1
so
-1 + ( 3 * 1 ) + ( 3 * -1 ) + 1
-1 + 3 - 3 +1
4 - 4
0
as ( -1 ) ³ = -1 , ( -1 )² = 1
so
-1 + ( 3 * 1 ) + ( 3 * -1 ) + 1
-1 + 3 - 3 +1
4 - 4
0
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