Question

Calculati:
a) [(-5)+(-8)]-[(-4)+(-7)]
b) -(-4+12)-(56-14-19+20)+8
c) -12-{10-3-[-24-(5X8)]}
d)(-9+11-12-8)-(-7+9-15-2)

Answer 1

a) [(-5)+(-8)]-[(-4)+(-7)] = (-13)-(-11) = .- 13 + 11 = -2
b) -(-4+12)-(56-14-19+20)+8 = - 8 - (42 - 19 + 20) = -  8 - (23 + 20) = - 8 - 43= - 35
c) -12-{10-3-[-24-(5X8)]} = 12 - [10 - 3 - (-24 - 40)] = 12 - [10 - 3  +64] = 12 - (- 7 +64] = 12 + 57 = 69   
d)(-9+11-12-8)-(-7+9-12 - 8) = (2 - 12 - 8) - (2 +12 - 8) = (-10 - 8) - (14 - 8) = -18 - 6 = -12