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-1/4a*b2= -1/4(1/3)*-3^2= -1/12*9=-3/4
2x^5 y^4 z^3= 2(-1)^5 (-3)^4 (2)^3= 2(-1) * 81 *8= -1296
-(-(4/5m^2 p^3)) = -(-(4/5 (-5)^2 * (1/4)^3)) = -(-(4/5(25) * 1/64))= -(-(20* 1/64))
=-(-(5/16))= 5/16