Question

Tính nhanh : 9 x 70 - 35 x 18 + 2020

Answer 1

\(=9\times\left(70-70\right)+2020\)

\(=0+2020=2020\)

Answer 2

2020

Answer 3

\(=9\times70-35\times2\times9+2020\)

\(=9\times\left(70-70\right)+2020=0+2020=2020\)