Question

Calcule a) (9-4)-(-9)-(-86)=
b) +90-8-7-90-3+6+4=
c) -8 (-9)+(-6)(-1)=
2. 10
d) (-2) +(-1) =

Answer 1

$a)5 + 9 + 86 = 100 \\ b) - 18 + 10 = - 8 \\ c) + 63 + 6 = 69 \\ d) - 2 - 1 = - 3$