Ответ:
а³+b³=(a+b)(a²-ab+b²)
(a+b)²=a²+2ab+b²
a²+b²=(a+b)²-2ab=9-2×(-10)=9+20=29
a³+b³=-3(29-(-10))
a³+b³=-3×39=-87
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Verified answer
Ответ:
а³+b³=(a+b)(a²-ab+b²)
(a+b)²=a²+2ab+b²
a²+b²=(a+b)²-2ab=9-2×(-10)=9+20=29
a³+b³=-3(29-(-10))
a³+b³=-3×39=-87