Giải thích các bước giải:
a,7/8+(5/-12+1/8)
=7/8+5/-12+1/8
=(7/8+1/8)+5/-12
=8/8+5/-12
=12/12+-5/12
=7/12
b,(-17/13+25/101)+4/13
=-17/13+25/101+4/13
=(-17/13+4/13)+25/101
=-13/13+25/101
=-101/101+25/101
=76/101
c,(-5/13+-8/13)+(1/4+3/4+2/8)
=-13/13+(4/4+2/8)
=-1+1+2/8
=2/8
d,(21/32+3/8)+(-7/11+5/8)+11/32
=21/32+3/8+-7/11+5/8+11/32
=(21/32+11/32)+(5/8+3/8)+7/11
=32/32+8/8+7/11
=1+1+7/11
=2+7/11
=2/1+7/11
=22/11+7/11
=29/11