600-330:3=600-110=490
4*250-2*500=1000-1000=0
400-60*3=400-180=220
909:3-101*2=301-202=99
850-123*0=850
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600-330:3=600-110=490
4*250-2*500=1000-1000=0
400-60*3=400-180=220
909:3-101*2=301-202=99
850-123*0=850