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Verified answer
6.6859 - 512 - 64
= 6347 - 64
= 6283
7.
15^3 - 3^3
= 3375 - 27
= 3348
8.
9^3 - 6^3
= 729 - 216
= 513
9.
10^3 + 8^3
= 1000 + 512
= 1512
10.
125 - (-64)
= 125 + 64
= 189