Question

tinh nhanh 2009 x 7 + 2009 x 2 + 2009

Answer 1

2009 x 7 + 2009 x 2 + 2009

= 2009 x (7 + 2) + 2009

= 2009 x    9 + 2009

= 18081 + 2009

= 20090

hoặc : 2009 x 7 + 2009 x 2 + 2009

          = 2009 x (7 + 2 + 1)

          =  2009 x 10

          = 20090

Answer 2

20090

Answer 3

2009 x 7 + 2009 x 2 + 2009 

= 2009 x 7 + 2009 x 2 + 2009 x 1

= 2009 x ( 7 + 2 + 1 )

= 2009 x 10

= 20090

nha

Answer 4

20090

Answer 5

2009 × 7 + 2009 × 2 + 2009 = 2009 × 7 + 2009 × 2 + 2009 x 1 = 2009 × (7+2+1) = 2009 × 10 = 20090

Answer 6

Má nó có tích đâu giải chi cho 😪