-5/18 · 2 1/10 + (-5/6) · 2 2/5 = -2 7/12
1) -5/18 · 2 1/10 = -5/18 · 21/10 = -(1·7)/(6·2) = -7/12
2) -5/6 · 2 2/5 = -5/6 ·12/5 = -12/6 = -2
3) -7/12 + (-2) = -2 7/12
ответ: (-2 целых 7/12).
-5/18 · 2 1/10 + (-5/6) · 2 2/5 = -2 7/12
1) -5/18 · 2 1/10 = -5/18 · 21/10 = -(1·7)/(6·2) = -7/12
2) -5/6 · 2 2/5 = -5/6 ·12/5 = -12/6 = -2
3) -7/12 + (-2) = -2 7/12
ответ: (-2 целых 7/12).