Question

Calculeaza folosind factorul comun
a) 7*37+43*7
b) 23 +9*23
c) 41*32-41*22
d) 10+20+30+40+50
e) 14+21+28+35
f) 4*2017+2017*2013-2017

Ajutați-mă!!

Answer 1

a) 7 × 37 + 43 × 7 =

7 × (37 + 43) =

7 × 80 =

560
___

b) 23 + 9 × 23 =

23 × (1 + 9) =

23 × 10 =

230
____

c) 41 × 32 - 41 × 22 =

41 × (32 - 22) =

41 × 10 =

410
___

d) 10 + 20 + 30 + 40 + 50 =

10 × (1 + 2 + 3 + 4 + 5) =

10 × 15 =

150
____


e) 14 + 21 + 28 + 35 =

2 × 7 + 3 × 7 + 4 × 7 + 5 × 7 =

7 × (2 + 3 + 4 + 5) =

7 × 14 =

98
__


f) 4×2017+2017×2013-2017 =

2017 × (4 + 2013 - 1) =

2017 × 2016 =

4 066 272
________