а)b³+3b²+3b+1
b³+3b²•1+3b•1+1³
b³+3b²•1+3b•1²+1³
(b+1)³
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а)b³+3b²+3b+1
b³+3b²•1+3b•1+1³
b³+3b²•1+3b•1²+1³
(b+1)³