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...=(2,25+1,6)* 9/2=3,85 *9/2=385/100* 9/2 = 77/20 * 9/2 = 693/40=17 13/40
2)
...=5 1/2 - 3/8 * 1/4 = 5 1/2 - 3/32=
=5 16/32 - 3/32=5 13/32