MN giúp mik với !!!!!!!!!!!!!!!!!!!

1./5-(1997-2005)+1997

=5-1997+2005+1997

=(5+2005)+(-1997+1997)

=2010

2/ =4567+1234-4567-4

=(4567-4567)+(1234-4)

=0+1230

=1230

3/=1579-53-1579+53

=(1579-1579)+(-53+53)

=0+0

=0

4/=(2001-2001)+(54-54)-15

=0+0-15

=-15

5/=13579-14+53-13579

=(13579-13579)+(-14+53)

=0+39=39

6/=14537-4+5-14537

=(14537-14537)+(-4+5)

=0+1=1

7/=6-5+5847+5-5847

=(-5+5)+(5847-5847)+6

=0+0+6=6

=