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b. 1/9 x 3^5 = ( 3^ -2) x 3^5 = 3^3
c. (0,04)² =( ( 0,2)²)²
= (0,2)^4 atau
= ( 2 x 10^ -1)^4
= 2^4 x {( 2 x 5)^ - 1}^4
= 2^4 x (2^-1)^4 x (5^-1)^4
= 2^4 x 2^ -4 x 5^-4
= 5^-4
= 1/ 5^4
keterangan ' ^ ' dibaca pangkat