Răspuns :
9*(13+5+10)=9*13+9*5+9*10=117+45+90=117+135=252
(28-9+14)*12=28*12-9*12+14*12=236-108+168=236+60=296
(28-9+14)*12=28*12-9*12+14*12=236-108+168=236+60=296
a)9x(13+5+10)=
9x13+9x5+9x10=
117+45+90=
117+135=252
b)
(28-9+14)x12=
28x12-9x12+14x12=
236-108+168=
236+60=296
9x13+9x5+9x10=
117+45+90=
117+135=252
b)
(28-9+14)x12=
28x12-9x12+14x12=
236-108+168=
236+60=296