Question

calcule as expressões
a)(-15+4)+[-18+(-3-7+5)]
b)-1+[1+(1-1)-1]
c)-1+(-2+5)+[-4(-6+5-8)]
d)-4+5-5+4-3+9+3​

Answer 1

a) (-15 +4) + [ -18+ (-3-7+5)]

(-11) + [-18 + (-5)]

-11 + [ -18 -5 ]

-11 -23

-34


b) -1 + [1 + (1-1) -1]

-1 + [1-1] —> zero

-1

c) -1 (-2+5) + [-4 (-6+5-8)]

-1 (+3) + [ -4 (-9) ]

-1 +3 [ -4 -9]

-1 +3 -13

-11

d) -4 +5 -5 +4 -3 +9 +3

+9