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

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

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

chúc bạn học tốt

`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`

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

a: =1250:25=50

b: =234(45+55)+234=23400+234=23634

c: =1000x1000=1000000

a: =100x26=2600

b: =78x10=780

c: =67x100=6700

d: =1000x575=575000

\(4\times26\times25=\left(4\times25\right)\times26=100\times26=2600\\ 63\times78-53\times78=\left(63-53\right)\times78=10\times78=780\\ 67\times92+67\times8=67\times\left(92+8\right)=67\times100=6700\\ 8\times23\times25\times125=\left(8\times125\right)\times\left(23\times25\right)=1000\times575=57500\)

a: =100x26=2600

b: =78x10=780

c: =67x100=6700

d: =1000x575=575000

a, 2x9x5x7x4x25

=2x5x4x25x9x7

=10x100x63

=63000

BẠN SAO THẾ A VÀ B dõ dàng

a, 4 x 25 x 9

= 100 x 9

= 900

b, 125 x 8 x 6

= 1000 x 6

= 6000

// bn cak lm sai conme đề rồi ạ?//

\(125\times25\times8\times4\)

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

\(=1000\times100\)

\(100000\)

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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