Question

stiind ca 1) a+b=-23 si c=-4, calculati a*c+b*c
2) a+b=18 si c=-9, calculati a*c+b*c
3) a-b=-48 si c=-3, calculati a*c-b*c
4) a-b=67 si c=-7, calculati a*c-b*c

Answer 1

Stiind ca 1) a+b=-23 si c=-4, calculati a*c+b*c
c(a+b)=(-4) *(-23) =92
2) a+b=18 si c=-9, calculati a*c+b*c
c(a+b)=(-9) *18 =-162
3) a-b=-48 si c=-3, calculati a*c-b*c
c(a-b)=(-3) *(-48) =144
4) a-b=67 si c=-7, calculati a*c-b*c
c(a-b)=(-7) *67 =-469

Answer 2

1. [-23]·[-4]=+92;
2. 18·[-9]=-162;
3. [-48]·[-3]=+144;
4. 67·[-7]=-469;