1) b^0.8 * b^-1.3 / b^-1.5 = b^(0.8 - 1.3) / b^-1.5 = b^-0.5 / b^-1.5 = b^(-0.5 + 1.5) = b^1 = b
2) c^(1/8) c^(5/6) c^(-1/2) = c^(1/8 + 5/6 - 1/2) = c^(6/48 + 40/48 - 24/48) = c^(22/48) = c^(11/24)
1) b^0.8 * b^-1.3 / b^-1.5 = b^(0.8 - 1.3) / b^-1.5 = b^-0.5 / b^-1.5 = b^(-0.5 + 1.5) = b^1 = b
2) c^(1/8) c^(5/6) c^(-1/2) = c^(1/8 + 5/6 - 1/2) = c^(6/48 + 40/48 - 24/48) = c^(22/48) = c^(11/24)