Question

tính nhanh: 

25.5.20.4.6+50.2.6+2.3.4.25

Answer 1

=(25.4).(5.20).6+(50.2).6+2.3.(4.25)

=100.100.6+100.6+2.3.100

=100.600+100.6+6.100

=100.600+600+600

=100.600+600.2

=600.(100+2)

=600.102

=61200

Answer 2

25.5.20.4.6+50.2.6+2.3.4.25

=(25.4).(20.5) .6 + (50.2 ) .6 + (25.4) .6

= 100.100.6 + 100.6 +100.6

= 6 . (100 .100 + 100+100 )

= 6 . ( 100* 102)

= 6 . 10200

=61200

Answer 3

25.5.20.4.6+50.2.6+2.3.4.25

=100.100.6+100.6+6.100

=10000.6+100.6+100.6

=6.(10000+100+100)

=6.1020

=61200

ai tk mk, mk tk lại.

Answer 4

25.5.20.4.6+50.2.6+2.3.4.25

=25.4.20.5.6+100.6+6.100

=100.100.6+100.6+6.100

=6(10000+100+100)

=6.10200

=61200

Answer 5

25.5.20.4.6+50.2.6+2.3.4.25

=(25.4).(20.5).6+100.6+6.100

=100.(100.6+6+6)

=100.612

=61200