d) \(202\times19-9\times202=202\times\left(19-9\right)=202\times10=2020\)
\(202\times19-9\times202=3838-1818=2020\)
202 x 19 - 9 x 202
= 3838 - 1818
= 2020
202 x ( 19-9)
= 202 x 10
= 2020
c1 202 *( 19-9)
= 202*10= 2020
Cách 2 bạn tính bth thui nhân chia trước cộng trừ sau
Cách 1:
d. 202 x 19 - 9 x 202
= 3838 - 1818
= 2020
Cách 2:
d. 202 x 19 - 9 x 202
= 202 x (19-9)
= 202 x 10
= 2020
\(C1:202\times19-9\times202=202\times\left(19-9\right)202\times10=2020\)
\(C2:202\times19-9\times202=3838-1818=2020\)
\(=202\times\left(19-9\right)=202\times10=2020\)
c2:\(=3838-1818=2020\)
