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9/2:26*18/5=9/2*1/26*18/5=81/130
b) 2 2/7*2 1/3:18*5 1/3=
16/7*7/3*1/18*16/3=128/81=1 47/81
c) 5 1/4*10/21-6 1/5*3 1/3=
21/4*10/21-31/5*10/3=5/2-62/3=15/6-124/6=-109/6=-18 1/6
d) (4 5/12+2 7/18):3 3/8=(53/12+43/18):27/8=(318/72+172/72):27/8=490/72:27/8=490/72*8/27=490/243=2 4/243