(5 18/7 : 3 + 10/21)² - (-16,568 : 15,2)² = 7,8119
1) 5 18/7 : 3 = 53/7 · 1/3 = 53/21
2) 53/21 + 10/21 = 63/21 = 3
3) 3² = 3 · 3 = 9
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4) -16,568 : 15,2 = -1,09
5) (-1,09)² = (-1,09) · (-1,09) = 1,1881
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6) 9 - 1,1881 = 7,8119
Ответ: 7,8119.