Question

calculeaza folosind factorul comun dupa model a) 723•4972-723•4541+723•569 b) 2783•5821+2783•2057-2783•7877 c) 41783•58912-41753•58912•41+58912•29 d) 71496•3189-71496•3180+71496

Answer 1

a) 723 x 4972 - 723 x 4541 + 723 x 569 =      dau factor comun pe 723

723 x (4972 - 4541 + 569) =

723 x 1000 =

723000

b) 2783 x 5821 + 2783 x 2057 - 2783 x 7877 =

2783 x (5821+2057-7877) =

2783 x 1 =

2783

c) 41783 x 58912 - 41753 x 58912 + 58912 x 41 + 58912 x 29 =

58912 x (41783-41753+41+29) =

58912 x 100

5891200

d) 71496 x 3189 - 71496 x 3180 + 71496 =

71496 x (3189-3180+1) =

71496 x 10 =

714960