Question

efectuati folosind factorul comun:
A)7 x 13 - 7 x 3=
b) 2008 x 2009 - 2006 x 2009 - 2 x 2008=
c)96 x 94 - 96 x 92 - 2 x 93=
d) (5+17) x (31+27) + (5+17) x (19+23)=
va rog!

Answer 1

Răspuns:

a)  

7 x 13 - 7 x 3 =

7 x (13 - 3) =

7 x 10 =

70

b)

2008 x 2009 - 2006 x 2009 - 2 x 2008 =

2009 x (2008 - 2006) - 2 x 2008 =

2009 x 2 - 2 x 2008 =

2 x (2009 - 2008) =

2 x 1 =

2

c)

96 x 94 - 96 x 92 - 2 x 93 =

96 x (94 - 92) - 2 x 93 =

96 x 2 - 2 x 93 =

2 x (96 - 93) =

2 x 3 =

6

d)

(5 + 17) x (31 + 27) + (5 + 17) x (19 + 23) =

(5 + 17) x (31 + 27 + 19 + 23) =

22 x 100 =

2200