1. d  x  (e  +  f )  =  d  x  e  +  d  x  f . Đúng hay sai?


2. c  x  ( b  +  d )  =  c  x  b  +  c  x  d. Đúng hay sai?


3.  a  x  (  b  +  c  )  =  a  x  b  +  a  x  c. Đúng hay sai?


4. 4  x  ( 5  +  7 )  = ?



5. 5  x  ( 3  +  7 )  =  5  x 3 + ?



6. 3  x  ( 8  +  6 )  =  24 +



7. 75  x  ( 2  +  10 )  = ?



8. 125  x  8  +  125  x  2   =



9. 65  x  ( 20  +  3 )  =



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