Question

tính bằng cách thuận tiện nhất :

a ) 2 x 3 x 4 x  8 x 50 x 25 x 125

b ) 45 x 128 - 90 x 64

ai tick mình mình tick lại

Answer 1

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

Answer 2

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

Answer 3

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

Answer 4

a)2x3x4x8x50x25x125

=(2x50)x(4x25)x(125x8)x3

=100x100x1000x3

=10000000x3

=30000000

b)45x128-90x64

=5760-5760

=0

Answer 5

a) 2 . 3 . 4 . 8 . 50 . 25 . 125 

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

= 100 . 100 . 1000 . 3

= 10000 . 3000

= 30000000

Answer 6

kết quả a 

= 30 000 000

kết quả b 

= 0

Answer 7

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

   = 3 x 2 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 100 x 100 x 1000 

   = 30 000 000

b) 45 x 128 - 90 x 64

  = 45 x ( 64 x 2 ) - 90 x 64

  = (45 x 2) x 64 - 90 x 64

  = 90 x 64 - 90 x 64

  = 0

Answer 8

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

= (2x50) x (4x25) x (8x125) x 3

= 100 x 100 x 1000 x 3

= 10000 x 1000 x 3

= 10000000 x 3

= 30000000

b) 45 x 128 - 90 x 64

= 5760 - 5760

= 0

Answer 9

a) 2x3x4x8x50x25x125

=(2x50)x(4x25)x(8x125)x3

=100    x100   x1000    x3

=10000000                  x3

=30000000

b) 45x128-90x64

=(45x128)-(90x64)

=5760     -5760

=0

Answer 10

a) 30 000 000    ;     b) 0

Answer 11

a, 2.3.4.8.50 .25.125

=(2.50).(4.25).(8.125).3

=100.100.1000.3

=100000.300

=30000000

b, 45.128-90.64

    =5760 -5760

     =0

   thu gọn

Answer 12

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