570 × 409 – 43516 / 86 × 275 / 4 – 73720 / 76 + 1668 × 7 =?
1)570*409=233130 2)43516/86*275/4=506*68,75=34787,5 3)73720/76=970 4)1668 × 7=11676 5)233130-34787,5-970+11676= 209048,5