La Red de Conocimientos Pedagógicos - Conocimientos educativos - Siete preguntas de cálculo sencillas

Siete preguntas de cálculo sencillas

1. 42×29-18×42-21×2

=42×29-18×42-42

=42×(29-18-1)

=42×10

=420

2, 172×56-79×36-93×36

=172×56-( 79 93)×36

=172×56-172×36

=172×(56-360

=172×20

=3440

3, 349×13 349×39 349×48

=349×(13 39 48)

=349×100p>

=34900

4 (425×5776-425 4225×425)÷125÷8

=425×(5776-1-4225)÷ (125 ×8)

=425×1550÷1000

=658,75

5, 99999×99999 199999

=99999× (100000 -1) 100000 99999

=9999900000-99999 100000 99999

=(9999900000 100000) (99999-99999)

=10000000000 0

=10000000000

6, 2004×20052005-2005×20042004

=2004×2005×10001-2005×2004×10001

=2004 ×2005 ×(10001-10001)

=2004×2005×0

=0

7, 20042005×20052004-20042004×20052005

== (20042004 1)×(20052005-1)-20042004*20052005

= 20042004×20052005-20042004 20052005-1-20042004×20052005

=(200420 0 4 ×20052005- 20042004×20052005)-2004×10001 2005×10001-1

=0 10001×(2005-2004)-1

= 10001-1

= 10000