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b)(6/5-2/7) /(2/5+2/3)=(42/35-10/35) / (6/15+10/15)= 32/35 : 16/15=32/35*15/16=6/7(po skróceniu)
c)(1 1/2-2,75) / (1 5/6-2 1/12)= (1 2/4- 2 3/4) /(1 10/12-2 1/12)= -1 1/4 : -3/12=-5/4* -4=5
d(1,25+27/8) (1 5/16+3/8)=(1 2/8+ 3 3/8) /(1 5/16+6/16)= 4 5/8 : 1 11/16=37/8*16/27=74/27=2 20/27
e)(1 5/6-0,625) /(4/13-25/39)=(1 5/6-5/8) /(12/39 -25/39)=(1 20/24-15/24) / (-13/39)=
1 5/24*( -3)= -3 15/24= -3 5/8