Question

tính nhanh: 420.67-190.67+33.230

Answer 1

420 . 67 - 190 . 67 + 33 . 230

= 67. ( 420 - 190 ) + 33 . 230 

= 67 . 230 + 33 . 230

= 230 . ( 67 + 33 ) 

= 230 . 100 

= 23000

Answer 2

\(420.67-190.67+33.230=67.\left(420-190\right)+33.230=67.230+33.230=230.\left(67+33\right)=230.100=23000\)

Answer 3

= 67. (420 - 190) + 33.230

= 67.230 + 33.230

= 230. (67 + 33)

= 230. 100

= 23000