Question

A: -12+3-(-9)
B: +22-[-20+(-12+9)]
C: -40+(-89+80)×(-90+49)​

Answer 1

a) -12 + 3 -(-9) = -12 + 3 + 9 = -12 + 12 = 0

b) 22-[-20 + (-12+9)]

= 22 -[-20 - 3]

= 22 - [-23]

= 22 + 23

= 45

c) -40 + (-89 + 80)x(-90 + 49)

= -40 + (-9)x(-41)

= -40 + 369

= 329.

Saludos y éxitos.