Question

Tính nhanh

3000 + 1000 - 7000 + 9000

 

Answer 1

3000+1000-7000-9000

=(3000+7000)-(1000+9000)

=10000-10000

=0

Answer 2

=0 nha

Answer 3

3000 + 1000 - 7000 +9000

=(3000 + 7000) - (1000 + 9000)

=10000 -  10000

=0

Answer 4

\(_{_{_{=0}=1000-1000}=\left(3000+7000\right)-\left(1000+9000\right)}3000+1000-7000+9000_{ }\)