Giúp mình với đang cần g

Bài 1

a) 537+272-653

=809-653

=156

b)271-[(-43)+271+(-17)]

=271-[228-(-17)]

=271-221

=60

c)-125.(26-36)

=-125.(-10)

=1250

d)25.(-4).5.(-20).(-7)

=(-100).(-100).(-7)

=-70000

e) (-37).(17-40)-23.37

=(-37).(-23)-23.37

=0

f)-53.64+36.(-53)

=-63.(64+36)

=-53.100

=-5300

Bài 2:

a)4/5+-5/4=16/20+-25/20=-9/20

b)-1/3+2/5+2/15=-5/15+6/15+2/15=1/5

c)3/4+(-3/4)+3/5+2/5+3/4=0+1+3/4=7/4

d)[(-6/13)+(-7/13)]+2=-1+2=-1

e) (21/13+10/13)+(44/53+9/53)+(-16/7)=1+1+(-16/7)=2/7

f)-5/7+(-2/7)+3/4+1/4+(-1/5)==1+(-1)+(-1/5)=-1/5

g)1/2+(-1/2)+(-2/3)+2/3+3/4+(-3/4)+4/5+(-4/5)+5/6+(-5/6)=0+0+0+0+0=0

h)7/5+(-1/15)+(-11/3)+11/2+1/6+(-2)=4/3+2+(-2)=4/3

Xin CTLHN + cảm ơn + vote 5 sao