Question

Efectuati,dand factor comun:
a) 38:37+38x63
b) 86x63-76x53
c) 2012x2011+2012x2013-2012x4024

Answer 1

a) 38:37+38x63 = 38*(37+63)=38*100=3800
b) 86x63-76x53 =   aici e ceva gresit  
ori e
86x63-86x53 =86*(63-53)=86*10=860
sau e
86x63-76x63 =63*(86-76)=63*10=630
sau e
86x53-76x53 =  53*(86-76)=53*10=510
sau e
76x63-76x53 =  76*(63-53)=76*10=710
  
c) 2012x2011+2012x2013-2012x4024 =2012(2011+2013-4024)=2012 *0

Answer 2

$a) 38:37+38*63 =$
   $38*(37+63)=$
    $38*(37+63)=$

$b) 86*63-76*53 =$ $Nu~ se ~poate.~Ori~ este ~86 ~in ~loc~ de ~76,~ ori~ este~ 63 ~in~loc~ de ~53 .$

$c) 2012*2011+2012*2013-2012*4024 =$
  $2012(2011+2013-4024)=2012 *0=2012$