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-5^2+3-5
-5^0 = 1
b. (3^3)^5 : 3^12 x 3^2
(3^15) : (3^12) x 3^2
(3^15-12+2) = 3^5
c. ((-3)^4))^3 : (-3^7)
(-3^12) : (-3^7)
(-3^12-7) = (-3^5)