190500+270144:268-3201600:320
190500 + 270144 / 268 – 3201600 / 320 = 181503 1)270144:268=1008 2)3201600:320= 10005 3)190500+1008=191508 4)191508-10005=181503
190500+270144:268-3201600:320=181503