3,49 x 1230-349-34,9 x 13
=349 x 12,3-349-349 x 1,3
=349 x (12,3-1-1,3)
=349 x 10
=3490
3,49 x 1230 - 349 - 34,9 x 13
= 349 x 12,3 - 349 - 349 x 1,3
= 349 x ( 12,3 - 1 - 1,3 )
= 349 x 10
= 3490
k mình nha
\(3,49\times1230-349-24,9\times13\)
\(=349\times12,3-349-349\times13\)
\(=349\times\left(12,3-1-1,3\right)\)
\(=349\times10\)
\(=3490\)