21.[(1 245 + 987) : \(2^3\) - 15.12] + 21
= 21. ( 2 232 : 8 - 180 ) + 21
= 21 . ( 279 - 180) + 21
= 21 . 99 + 21
= 21 . ( 99 + 1)
= 21 . 100
= 2 100
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