Lớp 4 chưa học cái này nha O^O

rồi nhá

cái này học lớp 4

( 2013 x 2014 + 2014 x 2015 + 2015 x 2016) x ( 1 + 1/3 - 4/3)

=( 2013 x 2014 + 2014 x 2015 + 2015 x 2016) x ( 4/3 - 4/3)

=( 2013 x 2014 + 2014 x 2015 + 2015 x 2016) x 0

=0

Ta có: \(\left(2013\cdot2014+2014\cdot2015+2015\cdot2016\right)\left(1+\dfrac{1}{3}-\dfrac{4}{3}\right)\)

\(=\left(2013\cdot2014+2014\cdot2015+2015\cdot2016\right)\left(\dfrac{3}{3}+\dfrac{1}{3}-\dfrac{4}{3}\right)\)

=0

a, 13 \(\times\) 15 - 150 + 97 \(\times\)15

13 \(\times\) 15 - 15 \(\times\) 10 + 97 \(\times\) 15

= 15 \(\times\) ( 13 - 10 + 97)

= 15 \(\times\) ( 3 + 97)

= 15 \(\times\) 100

=1500   

b, \(\dfrac{2016}{2015}\) \(\times\) \(\dfrac{4}{7}\) - \(\dfrac{4}{7}\) \(\times\) \(\dfrac{1}{2015}\) + \(\dfrac{3}{7}\)

= \(\dfrac{4}{7}\) \(\times\) ( \(\dfrac{2016}{2015}\) - \(\dfrac{1}{2015}\)) + \(\dfrac{3}{7}\) 

= \(\dfrac{4}{7}\) \(\times\) \(\dfrac{2015}{2015}\) + \(\dfrac{3}{7}\)

= \(\dfrac{4}{7}\) + \(\dfrac{3}{7}\)

= \(\dfrac{7}{7}\)

= 1

a, \(13\) \(\times\) 15 - 150 + 97 \(\times\) 15

= 15 \(\times\) ( 13 - 10 + 97)

= 15 \(\times\) ( 3 + 97)

= 15 \(\times\) 100

= 1500  

b, \(\dfrac{2016}{2015}\) \(\times\) \(\dfrac{4}{7}\) - \(\dfrac{4}{7}\) \(\times\) \(\dfrac{1}{2015}\) + \(\dfrac{3}{7}\)

= \(\dfrac{4}{7}\) \(\times\) ( \(\dfrac{2016}{2015}\) - \(\dfrac{1}{2015}\)) + \(\dfrac{3}{7}\)

= \(\dfrac{4}{7}\) \(\times\) \(\dfrac{2015}{2015}\) + \(\dfrac{3}{7}\)

= \(\dfrac{4}{7}\) + \(\dfrac{3}{7}\)

= \(\dfrac{7}{7}\)

= 1

  1002 × 2015 -2015 - 2015

 =1002 x 2015 - 2015 x1 - 2015 x 1

 =2015 x (1002 - 1 -1 )

 =2015 x 1000

 =2015000

kb k ^ - ^

1002 x 2015 - 2015 - 2015

= ( 1002 - 1 - 1 ) x 2015

= 1000 x 2015

= 2015000

Tk mk nhé ~~!!^_^

1002 x 2015 - 2015 - 2015 = 1002 x 2015 - 2015 x 1 - 2015 x 1 = 2015 x ( 1002 - 1 - 1 ) = 2015 x 1000 = 2015000

CHO MÌNH HỎI CÁI DẤU KIA LÀ GÌ VẬY BẠN

( 2014 x 2015 - 2016 ) : ( 2012 + 2013 x 2014 )

= ( 4058210 - 2016 ) : ( 2012 + 4054182 )

= 4056194 : 4056194

= 1

﴾ 2014 x 2015 ‐ 2016 ﴿ : ﴾ 2012 + 2013 x 2014 ﴿

= ﴾ 4058210 ‐ 2016 ﴿ : ﴾ 2012 + 4054182 ﴿

= 4056194 : 4056194

= 1

 ( 2014 x 2015 - 2016 ) : (2012 + 2013 x 2014 )

= ( 2014 x ( 2013 + 2 ) - 2016 ) : ( 2012 + 2013 x 2014 )

= ( 2014 x 2013 + 2014 x 2 - 2016 ) : ( 2012 + 2013 x 2014 )

= ( 2014 x 2 - 2016 ) : 2012

=  ( 4028 - 2016 ) : 2012 

=      2012       : 2012

= 1 

- ( 793 - 2015) + ( - 2015 - 1207)

= -793 + 2015 -2015 - 1207

= ( -793 - 1207) + (2015 -2015)

= -2000 +0

= -2000

- ( 793 - 2015 ) + ( - 2015 - 1207 )

=793+2015+(-2015)-1207

=(793+1207)-[2015+(-2015)]

=2000-0

=0

2014 x 512 + 2015 x 488

= 2014 x 512 + ( 2014  + 1 ) x 488

= 2014 x 512 + 2014 x 488 + 488

= 2014 x ( 512 + 488 ) + 488

= 2014 x 1000 + 488

= 2 014 000 + 488

= 2 014 488

\(\text{2014 x 512 + 2015 x 488 = 2014 x 512 + ( 2014  + 1 ) x 488 = 2014 x 512 + 2014 x 488 + 488 = 2014 x ( 512 + 488 ) + 488 = 2014 x 1000 + 488 = 2 014 000 + 488 = 2 014 488}\)

\(2014\times512+2015\times488=2014\times512+\left(2014+1\right)\times488\)

\(=2014\times512+2014\times488+488\)

\(=2014\times\left(512+488\right)+488\)

\(=2014\times1000+488\)

\(=2014000+488\)

\(=2014488\)