\(2019\times58+2019\times42+78\)
\(=2019\times\left(58+42\right)+78\)
\(=2019\times100+78\)
\(=201900+78\)
\(=201978\)
2019 x 58 + 2019 x 42 + 78
= 2019 x ( 58 + 42 ) + 78
= 2019 x 100 + 78
= 201900 + 78 = 201978
A = 2019 x 58 + 2019 x 42 + 78
A = (2019 x 58 + 2019 x 42) + 78
A = 2019 x ( 58 + 42) + 78
A = 2019 x 100 + 78
A = 201900 + 78
A = 201978
2019 x 58 + 2019 x 42 + 78
= 2019 x ( 58 + 42 ) + 78
= 2019 x 100 + 78
= 201900 + 78
=201978
=2019×(58+42)+78
=2019×100+78
=201900+78
201978
2019 x (58+42) +78
=201 x 100 +78
=20100 + 78
=20178
(trên lớp không nghe giảng à ?)
<nhớ tick cho mình>
