Question

tính nhanh phép tính : 2019+2019+2019+2019+2019x7-2019

Answer 1

\(2019+2019+2019+2019+2019\times7-2019\\ =2019\times\left(1+1+1+1+7-1\right)\\ =2019\times10\\ =20190\)

Answer 2

Tính bằng cách thuận tiện nhất.

2019 + 2019 +2019 + 2019 + 2019 x 7 - 2019

= 2019 x ( 7 +1 +1+1 - 1 ) = 2019 x 10 = 20190

Answer 3

= 20190

Answer 4

\(2019+2019+2019+2019+2019\text{×}7-2019\\ =2019\text{×}1+2019\text{×}1+2019\text{×}1+2019\text{×}1+2019\text{×}7-2019\text{×}1\\ =2019\text{×}\left(1+1+1+1+7-1\right)=2019\text{×}10=20190\)

Answer 5

= 20190 nha