The mean is derived by adding all of the numbers and then dividing by the number of numbers you added. In this case, 1264+3+146 divided by 3 = 471.
On the other hand, if the dashes in the equation are intended as a minus sign as opposed to simply a way to separate the numbers, the answer would be 1264-3-146 divided by 3 = 371.66
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12/6 = 2
1/3 + 1/4 = 4/12 + 3/12 = 7/12
7/12 - 1/4 = 7/12 - 3/12 = 4/12 = 1/3.
-3/4 + -7/12 = (-3×3)/(4×3) + -7/12 = -9/12 + -7/12 = (-9 + -7)/12 = -16/12 = (-4×4)/(3×4) = -4/3 = -1 1/3.
1/4 + 1/3 = 7/12 *The addition requires both fractions to have the same denominator. 1/4 x 3/3 = 3/12 1/3 x 4/4 = 4/12 3/12 + 4/12 = 7/12