Question

sendo x=4,123×10^19 e y=4,012×10^15, calcule x+y e x+y

Answer 1

x=4,123 .10^19
y=4,012 .10^15
x+y =10 ^15 (4,012 + 4,123 . 10^4) = (4,012 + 4123) . 10^15=
4123, 012 . 10^15 = 4, 1234012 . 10^4  . 10 ^15 = 4, 1234012 . 10^11
x- y = 4,123 . 10 ^19  - 4, 012 . 10^15 (4, 123 . 10 ^4 - 4,012) =
10^15 (41230 - 4, 012) = 41225, 988 . 10^15= 4,1225 . 10 . 10 - 4.10^15=
4, 1225988 . 10^11