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calculate please

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You need to follow the "order of operations", PEMDAS:
 
P = Parentheses
E = Exponents
M = Multiplications
D = Divisions
A = Additions
S = Subtractions
 
a) 5[3-8*3^2+4*6-2]   (First we need to do all operations in the brackets (parentheses))
 
= 5[3-8*9+4*6-2]      (Exponents 32 = 9) 
= 5[3-72+24-2]          (Multiplications 8*9 = 72, 4*6=24)
= 5[3-96-2]                (No divisions, so next is additions: 72+24=96)
= 5[-95]                     (Subtractions: 3-96 = -93, -93-2 = -95)
= -475                (Now multiply the 5 outside the bracket by the result (-95) inside the bracket)
 
b) Works the same as a) but involves a division.  Do the numerator first, then the denominator, then divide the numerator by the denominator last.