Question

efetue as abstrações a seguir
a)(+17)-(+9)
b)(-15)-(-7)
c)(-23)-(-4)
d)(-42)-(-7)-(-8)
e)(+5)-(-21)-(+9)
f)(-71)-0
​

Answer 1

Resposta:

$( + 17) - ( + 9) = + 8 \\ ( - 15) - ( - 7) = - 8 \\ ( - 23) - ( - 4) = - 19 \\ ( - 42) - ( - 7) - ( - 8) = - 27 \\ ( + 5) - (21) - ( + 9) = - 25 \\ ( - 71) - 0 = - 71$