Question

dau coronaaaaaaaaaaa ​

Answer 1

e)

$( - 4 + 1) + ( - 8 + 11) + ( - 7 + 20) = - 13 \\ - 3 + 3 + ( - 13) = - 13 \\ 0 + ( - 13) = - 13$

f)

$( - 7 + 10) + ( - 5 + 12) + ( - 3 + 15) = 22 \\ 3 + 7 + 12 =22 \\ 10 + 12 = 22$

g)

$( - 8 + 2) + ( - 8 + 15) + ( - 3 + 10) = 8 \\ - 6 + 7 + 7 = 8 \\ 1 + 7 = 8$

h)

$( - 3 + 7) + ( - 9 + 2) + ( - 5 + 15) =7 \\ 4 + ( - 7) + 10 = 7 \\ - 3 + 10 = 7$

sper ca te am ajutat :D