1 tính

1 tính 
a 2/11-5/3+9/11-8/13-4
b -5/12-0,75
c -8/18-15/27
d 5/3+0,25-8/3-7/4+3/2
f -5/7+3/4+-1/25+-1/5 -2/7+1/4
g -3/31+-6/17- -1/25 + -28/31 +11/-17 +-1/5