Question

Folosind factorul comun calculati:
a) 12x89+78x12
b)2956x1995-1995x2955
c)123x389+123x11-50x123

Answer 1

a) 12x89+78x12=12x(89+78)=12x167=2004

b)2956x1995-1995x2955=1995x(2956-2955)=1995

c)123x389+123x11-50x123=123x(389+11-50)=123x350=43050

Answer 2

$a).12 \times 89+78 \times 12=12(89+78)=12 \times 167=2004 \\ b).2956 \times 1995-1995 \times 2955=1995(2956-2955)=1995 \times 1=1995 \\ c).123 \times 389+123 \times 11-50 \times 123=123(389+11-50)= \\ =123(400-50)=123 \times 350=43050$