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59/12+11/8=118/24+33/24=151/24
2) 11/5+29/6=66/30+145/30=211/30
211/30-39/10=211/30-117/30,=94/30
3)41/8-13/5=205/40-104/40=101/40
101/40+91/20=101/40+182/40=283/40
4 11/12 + 1 3/8+ 4 22/24 + 1 9/24= 6 7/24
b) 2 1/5 + 4 5/6= 2 6/30+ 4 25/30= 7 1/30
7 1/30 - 3 9/10= 7 1/30 - 3 27/30= 3 4/30 = 3 2/15
c) 5 1/8 - 2 3/5= 3 5/40 - 2 24 /40= 21 /40
21/40 + 4 11/20 = 21/40 + 4 22/40= 5 3/40