a, 2019 x (2 x 5)

= 2019 x 10

= 20 190

b, (5 x 2) x (8 x 125) x 9

= 10 x 1000 x 9

= 90 000

c, (4 x 25) x 2019

= 100 x 2019

= 201 900

d, (50 x 2) x (125 x 8) x 202

= 100 x 1000 x 202

= 20 200 000

a) 2019 x 2 x 5

= (2 x 5) x 2019

= 10 x 2019

b) 5 x 8 x 9 x 2 x 125

= (5 x 2) x (125 x 8) x 9

= 10 x 1000 x 9

= 10000 x 9

= 90000

c) 4 x 2019 x 25

= (4 x 25) x 2019

= 100 x 2019

= 201900

d) 50 x 125 x 2 x 8 x 202

= (50 x 2) x (125 x 8) x 202

= 100 x 1000 x 202

= 100000 x 202

= 20200000

b. 2 x 8 x 50 x 25 x 125 = (2 × 50) × (8 × 125) × 25

= 100 × 1000 × 25

= 100000 × 25

= 2500000

= ( 2x50) x ( 8x125) x 25

= 100 x 1000 x 25

100000 x 25

= 2500000

b. 2 x 8 x 50 x 25 x 125 = (2 × 50) × (8 × 125) × 25

= 100 × 1000 × 25

= 100000 × 25

= 2500000

`5 xx 74 xx 2  = 5xx 2 xx 74 = 10xx74 = 740`

`4xx196xx5 = 4xx5xx196 = 20xx196 = 3920`

`(50 + 25)xx4 = 50xx4 + 25xx4 = 200 + 100 = 300`

`125xx(80+8) = 125xx80 + 125xx8 = 10000 + 1000 = 11000`

      \(202x\frac{3}{4}+202x\frac{5}{4}+202x8\)

\(=202x\left(\frac{3}{4}+\frac{5}{4}+8\right)\)

\(=202x\left(\frac{8}{4}+8\right)\)

\(=202x\left(2+8\right)\)

\(=202x10\)

\(=2020\)

\(=202*(\frac{3}{4}+ \frac{5}{4}+8) = 202*9 = 1818\)

    202 x \(\frac{3}{4}\) + 202 x\(\frac{5}{4}\) + 202 x 8

= 202 x ( \(\frac{3}{4}\)+\(\frac{5}{4}\)+ 8 )

= 202 x ( \(\frac{8}{4}\)+ 8 )

= 202 x ( 2 + 8 )

= 202 x 10

= 2020 . 

a) 19,17x25x4=19,17(25x4)=19,17x100=1917

b)1,79x(8x125)=1,79x1000=1790

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Trả lời :

25 x 8 x 50 x 125 x 4 x 2

= ( 25 x 4 ) x ( 8 x 125 ) x ( 50 x 2 )

= 100 x 1000 x 100

= 100 000 000

~HT~

#sad

a ) 2 x 3 x 4 x 8 x 50 x 25 x 125

  = 3 x 2 x 50 x 4 x 25 x 8 x 125

  = 3 x ( 2 x 50 ) x ( 4 x 25 ) x ( 8 x 125 )

  = 3 x 100 x 100 x 1000

  = 30000000

b ) 45 x 128 - 90 x 64

  = 45 x ( 2 x 64 ) - 90 x 64

  = ( 45 x 2 ) x 64 - 90 x 64

  = 90 x 64 - 90 x 64

  = 0

a) = (2.50).(4.25).(8.125).3=100.100.1000.3=30000000

b)45.128-90.64=45.128-45.2.64

=45.128-45.128

=0

a) 2 x 3 x 4 x 8 x 50 x 25 x 125
=  (25 x 4) x (50 x 2) x (125 x 8) x 3
=  100 x 100 x 1000 x 3
=  30000000

b) 45 x 128 - 90 x 64
=  45 x 128 - 45 x 2 x 64
=  45 x 128 - 45 x 128
=  0

\(125\times25\times8\times4\)

\(=\left(125\times8\right)\times\left(25\times4\right)\)

\(=1000\times100\)

\(100000\)

125 x 25 x 8 x 4

= (125 x 8) x (25 x 4)

= 1000 x 100

= 100 000

c)125 x 25 x 8 x 4

=(125 x 8 ) + (25 x4 )

=1000 +100

=1100

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