Question

S=15⁰+(-21)⁰-2³+(-12)¹​

Answer 1

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15⁰+(-21)⁰-2³+(-12)¹

=1+(−21)^0−2^3+(−12)^1

=1+1−2^3+(−12)^1

=2−2^3+(−12)^1

=2−8+(−12)^1

=−6+(−12)^1

=−6+−12

=−18