Question

1.tính nhanh

a) 32 x 75 + 68 x 84 + 65 x 32 + 68 x 56

Ai nhanh Mk tick .Mk đag gấp

Answer 1

32 . 75 + 68 . 84 + 65 . 32 + 68 . 56

= 32 . ( 75 + 65 ) + 68 . ( 84 + 56 )

= 32 . 140 + 68 . 140

= 140 . ( 32 + 68 )

= 140 . 100

= 14000

Answer 2

32 x 75 + 68 x 84 + 65 x 32 + 68 x 56

= ( 32 x 75 ) + ( 65 x 32 ) + ( 68 x 84 ) + ( 68 x 56 )

= 32 x ( 75 + 65 ) + 68 x ( 84 +56 )

= 32 x 140 + 68 x 140

= 140 x ( 32 + 68 ) 

= 140 x 100

= 14000

Answer 3

[​32.(75+65)]+[68.(56+84)]

=32.140+68.140

=140.(68+32)

=140.100

=14000

Answer 4

32 x 75 + 68 x 84 + 65 x 32 + 68 x 56

= 32 x [ 75 + 65 ] + 68 x [ 84 + 56 ]

= 32 x 140           + 68 x 140

= [ 32 + 68 ] x 140

= 98             x 140

= 13720

Answer 5

Giúo tui bài này đi 68 × 84 + 15 68 +68