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f(1/2) = 2(1/2)2-2(1/2)-12
= 2(1/4)-1-12
=1/2-1-12
= -25/2
tolong ditandai sebagai jawaban terbaik
f(1/2) = (2.1/2)²-(2.1/2)-12
= (1)²-1-12
= 1-1-12
= -12