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b) 20 1/19+2 3/38=381/19+79/38=762/38+79/38=841/38=22 5/38
c) 5 6/9-3 1/7=51/9-22/7=357/63-198/63=159/63=2 33/63
d) 11 1/5-2 6/8=11,2-2,75=8,45
e) 13 5/8+4 8/9=109/8+44/9=981/72+352/72=629/72=8 53/72
f) 2 3/4+5 1/3=11/4+16/3=33/12+64/12=97/12=8 1/12
g) 17 3/7+2 3/4=122/7+11/4=488/28+77/28=565/28=20 5/28
h) 12 1/2-3 3/4 = 12,5-3,75=8,75