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(a-b)³=a³-3a²b+3ab²-b³
(x+1)³=x³+3x²*1+3x*1+1=x³+3x²+3x+1
(x+4)³=x³+3x²*4+3x*4²+4³=x³12x²+48x+64
(x-2)³=x³-3x²*2+3x*2²-2³=x³-6x²+12x-8
(x-5)³=x³-3x²*5+3x*5²-5³=x³-15x²+75x-125