а^(12)·а^(-20):а^(-9)= а^(12+(-20)-(-9))= а^(12-20+9)=а^(21-20)= а^1=а
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а^(12)·а^(-20):а^(-9)= а^(12+(-20)-(-9))= а^(12-20+9)=а^(21-20)= а^1=а