Question

Answer 1

Hmm..!!Hình như hơi nhìu ák :<

Answer 2

ko rõ dấu đâu chụp lại đi

 

Answer 3

b,=5/8+3/17+4/18-20/17-2/9+21/56

=( 5/8+21/56)+(3/17-20/17)+(4/8-2/9)

=1-1+0=0

xin 1 nai  ,rồi làm nốt

Answer 4

c,=(-5/12+5/12)+(6/11+5/11)+7/17

=0+1+7/17

=34/17

Answer 5

d,=9/16+(-8/27)+23/16+(-12/7)

=(9/16+2316)+[-8/27+(-12/27)]

=2+(-20/27)

=34/27

Answer 6

=(-17+4/13)+2/135+(11+20/31)

=-1+2/135+1

=2/135