Question

Tính nhanh

2019 x 58  + 2019 x 42 + 78

Answer 1

\(2019\times58+2019\times42+78\)

\(=2019\times\left(58+42\right)+78\)

\(=2019\times100+78\)

\(=201900+78\)

\(=201978\)

Answer 2

2019 x  58 + 2019 x 42 + 78

= 2019 x ( 58 + 42 ) + 78

= 2019 x 100 + 78

= 201900 + 78 = 201978

Answer 3

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

Answer 4

2019 x 58 + 2019 x 42 + 78

 

= 2019 x ( 58 + 42 ) + 78

 

= 2019 x 100 + 78

 

= 201900 + 78 

=201978

Answer 5

=2019×(58+42)+78

=2019×100+78

=201900+78

201978

Answer 6

2019 x (58+42) +78
=201 x 100 +78
=20100 + 78
=20178
(trên lớp không nghe giảng à ?)
<nhớ tick cho mình>