В скобках получится -35/12
при делении 36/12=3
4 части ))))))))))))))))))))))))))))))))))
приведём к общему знаменателю u.
тогда получится; (2b-b+c)/u=(b+c)/u.
a) с₉ = 17 d = 2 c₁ = ?
c₉ = c₁ + 8d
c₁ = c₉ - 8d = 17 - 8 * 2 = 17 - 16 = 1
б) c₄ = 7 c₉ = - 8 c₁ = ?
![\left \{ {{c_{9}=-8 } \atop {c_{4}=7 }} \right.\\\\-\left \{ {{c_{1} +8d=-8} \atop {c_{1}+3d=7 }} \right.\\ -------\\\\5d=-15\\\\d=-3](https://tex.z-dn.net/?f=%5Cleft+%5C%7B+%7B%7Bc_%7B9%7D%3D-8+%7D+%5Catop+%7Bc_%7B4%7D%3D7+%7D%7D+%5Cright.%5C%5C%5C%5C-%5Cleft+%5C%7B+%7B%7Bc_%7B1%7D+%2B8d%3D-8%7D+%5Catop+%7Bc_%7B1%7D%2B3d%3D7+%7D%7D+%5Cright.%5C%5C+%C2%A0-------%5C%5C%5C%5C5d%3D-15%5C%5C%5C%5Cd%3D-3)
c₁ = 7 - 3d = 7 - 3 * (- 3) = 7 + 9 = 16
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