Question

Tính nhanh :

679 +679 x 123 - 679 x 24

245 x 327 - 245 x 18 - 9 x 245

Answer 1

679+679x123-679x24

=679x1+679x123+679x24

=679x(1+123-24)

=679x100

=67900

 

245x327-245x18-9x245

=245x(327-18-9)

=245x300

=73500

Answer 2

679 +679 x 123 - 679 x 24

= 679 x ( 1 + 123 - 24 ) 

= 679 x 100

= 67900

 

245 x 327 - 245 x 18 - 9 x 245

= 245 x ( 327 - 18 - 9 ) 

= 245 x 300

= 73500

 

Answer 3

679+679x123-679x24

=679x1+679x123-679x24

=679x(1+123-24)

=679x100

=67900

245x327-245x18-9x245

=245x(327-18-9)

=245x300

=73500

Answer 4

679+679*123-679*24

=679*1+679*123-679*24

=679*(1+123-24)

=679*100

=67900

245*327-245*18-9*245

=245*(327-18-9)

=245*300

=73500

Answer 5

679+679x123-679x24

=679x(1+123-24)

=679x100

=67900

245x327-245x18-9x245

=245x(327-18-9)

=245x300

=73500