Question

Calculați folosind factorul comun:

1. 39 • 27 + 39 • 52 - 39 • 79 =

2. 723 • 4972 - 723 • 4541 + 723 • 569 =

3. 2783 • 5821 + 2783 • 2057 - 2783 • 7877

4. 41283 • 58912 - 41753 • 58912 + 52912 • 41 + 58912 • 29 =

Answer 1

2) =723(4972-4541+569)=723x1000=723.000

1).=39(27+52-79)=39x0=0

3). =2783(5821+2057-7877)=2783x1=2783

4). = 58912(41283-41753+41+29)=58912x(-400)= -23.564.800