Question

Coroana ! ! ! Calculati , folosind scoaterea factorului comun : a ) 63 * 52 + 63 , b ) 57 + 57 * 85 , c ) 80 * 45 + 45 , d ) 27 * 108 - 27 , e ) 207 * 35
- 35 , f ) 57 * 176 - 57 .

Answer 1

a) 63•52+63= 63(1•52+1)
=63•53= poti calcula..
b)57+57•85 =57(1+1•28) = 57•29=..
c) 80•45+45= 45(35•1+1) 45•36
d) 27•108-27=27(1•4-1)=27•3=81