Question

Tính nhanh

815-23-77+85

Answer 1

815 - 23 - 77 + 85 

= 815 + 85 - 23 - 77

= ( 815 + 85 ) - ( 23 + 77 )

= 900 - 100

= 800

Answer 2

\(815-23-77+85\)

\(=\left(815+85\right)-\left(23+77\right)\)

\(=900-100=800\)

Answer 3

= 800

HOK TỐT

Answer 4

815-23-77+85

=815+85-(23+77)

=900-100

=800

mình nha

Answer 5

815 - 23 - 77 + 85

= ( 815 - 85 ) - ( 77 + 23 ) 

=  730 - 100 

= 630

Answer 6

=[815-85]-[23+77]

=730-100

=630

Answer 7

[815+85]+[23+77]=900+100=1000