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klo dipangkatin dlu br di kurang 5..hsilnya ya..
2 x 4^2 -5 = 27 trus 2 x 5^2 -5 = 45 br hsil 27 + 45 =72
tp klo pangkatnya dikurang 5 dlu tentu jd negatif pangkat nya..brrti angkanya jd pechan..
>> 2.4^-3 = 2.1/64... trus 2.5^-3 = 2.1/125