Question

Calculeaza in doua moduri,dupa model.
Exemplu:11*(15+65)=11*80=880 si 11*(15+65)=11*15+11*65=165+715=880

a) 17*(103+47)
b) 28*(153+207)
c) (27+37)*18
d) (92+218)*8
e) 35*(59-35)
f) 43*(247-159)
g) (78-39)*14
h) (129-109)*456

Dau coroana

Answer 1

17*(103+47)=17*150=2550;
17*(103+47)=17*103+17*47=1751+799;
28*(153+207)=28*360=10080;
28*(153+207)=28*153+28*207=4284+5796;
(27+37)*18=64*18=1152;
(27+37)*18=27*18+37*18=486+666;