ineedahoranhug 549. 2^-9 × 2^-3/2^-7 = 2^-12/2^-7 = 2^-5
550. 3^-7 × 3^-5/3^-9 = 3^-12/3^-9 = 3^-3

melkiyegik (2^(-9) * 2^(-3) )/2^(-7) = 2^(-9+(-3)-(-7))=2^(-9-3+7)=2^(-5)
(3^(-7)*3^(-5))/3^(-9)=3^(-7+(-5)-(-9))=3^(-7-5+9)=3^(-3)