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(a+b)³=a³+b³+3ab(a+b)
1000=a³+b³+3×21×10
1000=a³+b³+630
Thus, a³+b³=370
Pls mark my answer brainliest
linauma:
(a+b)^3-3ab(a+b)=a^3+b^3
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