(503,44/12,4-225,36/7,2)*(1,6905/0,49)=

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(503,44:12,4-225,36:7,2)•(1,6905:0,49)=32,085.
1) 503,44:12,4=40,6.
2) 225,36:7,2=31,3.
3) 40,6-31,3=9,3.
4) 1,6905:0,49=3,45.
5) 9,3•3,45=32,085.