8 x 2.019 x 125 - 250 x 2.018 x 4

= (8 x 125) x 2.019 - (250 x 4) x 2.018

= 1.000 x 2.019 - 1.000 x 2.018

=2.019.000 - 2.018.000

= 1.000

nhớ tick nhe

=(8*125)*2019-(125*4)*2018

=1000*2019-1000*2018

=1000*(2019-2018)=1000*1=1000

8 x 2019 x125 - 250 x 2018 x 4

= ( 8x 125) - ( 250x 4)x 125

=1000-1000 x 125

0 x 125

= 0

mk chẳng bt đúng ko nữa

giúp mình nha, mình cần gấp

( 4/9 + 7/9 -  2/9 ) x 19/24  = 1 x 19/24 = 19/24

\(=\dfrac{19}{24}\times\left(\dfrac{4}{9}+\dfrac{7}{9}-\dfrac{2}{9}\right)=\dfrac{19}{24}\times1=\dfrac{19}{24}\)

\(\dfrac{19}{24}\times\left(\dfrac{4}{9}+\dfrac{7}{9}-\dfrac{2}{9}\right)\)

\(=\dfrac{19}{24}\times1=\dfrac{19}{24}\)

\(\dfrac{9}{4}\times\dfrac{15}{11}+\dfrac{3}{4}:\dfrac{11}{7}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times3\times\dfrac{15}{11}+\dfrac{3}{4}\times\dfrac{7}{11}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times\dfrac{45}{11}+\dfrac{3}{4}\times\dfrac{7}{11}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times\left(\dfrac{45}{11}+\dfrac{7}{11}-\dfrac{8}{11}\right)\)
\(=\dfrac{3}{4}\times4\)
\(=3\)

`9/4xx15/11+3/4:11/7-3/4xx8/11`

`=3/4xx15/11xx3+3/4xx7/11-3/4xx8/11`

`=3/4xx45/11+3/4xx7/11-3/4xx8/11`

`=3/4xx(45/11+7/11-8/11)`

`=3/4xx4`

`=3`

1) 3/9 + 5/9 = 8/9

2) 1/2 x 2/3 x 3/4 x 4/5

= 1/5

(1-1/2)×(1-1/3)×(1-1/4)×(1-1/5)×1-1/6=1/2×2/3×3/4×4/5×5/6=1/6

2,3x4,5+2,3x2,5+7x7,7

=2,3x(4,5+2,5)+7x7,7

=2,3x7+7x7,7

=7x(2,3+7,7)

=7x10

=70

( 54 x 15 ) :9

=54:9x15

=90

( 56 x 23 x 4 ) :7

=56:7x23x4

=8x23x4

=32x23

=736

( 54 x 15 ) :9= 90                     ( 56 x 23 x 4 ) :7=736