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Aus Online Mathematik Brückenkurs 1

The numbers 9 and 27 can both be written as powers of 3,

927=33=32=39=333=33.

Thus, all factors in the expression can be written using a common base and the whole product can be simplified using the power rules

3139−327−2=313(32)−3(33)−2=31332(−3)33(−2)=3133−63−6=313−6−6=31=3.