Răspuns :
[tex]a) \\ \\ - 2 + - 20 = - 22 \\ \\ b) \\ \\ 5 + - 12 = - 7 \\ \\ c) \\ \\ 6 + - 15 = - 9 \\ \\ d) \\ \\ - 5 - ( - 7) = 2 \\ \\ e) \\ \\ 8 + - 20 = - 12 \\ \\ f) \\ \\ 40 - 40 = 0 \\ \\ g) \\ \\ 2 + - 18 = - 16 \\ \\ h) \\ \\ - 42 - 30 = - 72 \\ \\ i) \\ \\ - 24 - ( - 12) = - 12[/tex]
a) - 2 + ( - 5 ) • 4 = - 2 - 20 = - 22
b) 5 + 4 • ( - 3 ) = 5 - 12 = - 7
c) 6 -3 • ( - 5 ) = 6 + 15 = 21
d) - 5 - 7 • ( - 1 ) = - 5 + 7 = 2
e) 8 + 5 • ( - 4 ) = 8 - 20 = - 12
f) ( - 5 ) • ( - 8 ) - 4 • 10 = + 40 - 40 = 0
g) ( - 1 ) • ( - 2 ) + 3 • ( - 6 ) = + 2 - 18 = - 16
h) 7 • ( - 6 ) - 6 • 5 = - 42 - 30 = - 72
i) 2 • ( - 3 ) • 4 - ( - 3 ) • ( + 4 ) =( - 6 ) • 4 - ( - 12) = - 24 + 12 = - 12