9-(7-d)-(-2+t) = 9 - 7 + d + 2 - t = 4 + d - t
-9-(-7+d)+(z-t) = -9 + 7 - d + z - t = -2 - d + z - t
4) 6y : (-8)
Коэффициент: -\frac{6}{8} = -\frac{3}{4}
14) -6 ⋅ a ⋅ 4
Коэффициент: -6 ⋅ 4 = -24
24) c ⋅ (-8) ⋅ \frac{1}{4}
Коэффициент: -8 ⋅ \frac{1}{4} = -2
-11 ⋅ 7 + 42 = -77 + 42 = -35
(-6.3 + 16.8) : 12 = 10.5 : 12 = 0.875
Ответ: -35, 0.875