Question

Folosind factorul comun,calculeaza:

a) 15*87+15*13
b) 2456*2017+2017*2544
c) 197*489+197*112-301*197
d) 78*13-8*78+26*78-78

Dau coroana

Answer 1

Răspuns:

Folosind factorul comun,calculeaza:

a)

15 x 87 + 15 x 13 =

15 x (87 + 13) =

15 x 100 =

1500

b)

2456 x 2017 + 2017 x 2544 =

2017 x (2456 + 2544) =

2017 x 5000 =

10085000  

c)

197 x 489 + 197 x 112 - 301 x 197 =

197 x (489 + 112 - 301) =

197 x 300 =

59100

d)

78 x 13 - 8 x 78 + 26 x 78 - 78 =

78 x (13 - 8 + 26 - 1) =

78 x 30 =

2340

Answer 2

a) 15*87 + 15*13 = 15*(87 + 13) = 15*100 = 1500

b) 2456*2017+2017*2544=2017*(2456+2544 =2017*5000=10 085 000

c) 197*489+197*112-301*197 =197*(489+112-301)=197*300 = 59 100

d) 78*13-8*78+26*78-78=78*(13-8+26-1) = 78*30 = 2340