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Résoudre dans R les équations et inéquations suivantes : 1) 5(x−1) = 4−x 2) 2x²−5x = 0 3) (x+1)/(x−1) = 3/2 4) (x−1)(4−x) ≥ 0 5) 2x²−x−3 ≥ 0

Mathematics

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سأقوم بحل التمرين 4 باستخدام طريقة المحددات.

لحل النظام:

{2x−3y=11x+y=−22\begin{cases} 2x - 3y = 11 \\ x + y = -22 \end{cases}
  1. حساب محدد المصفوفة الرئيسية DD.

    D=∣2−311∣=(2)(1)−(−3)(1)=2+3=5D = \begin{vmatrix} 2 & -3 \\ 1 & 1 \end{vmatrix} = (2)(1) - (-3)(1) = 2 + 3 = 5
  2. حساب محدد DxD_x (بتبديل عمود معاملات xx بعمود الثوابت).

    Dx=∣11−3−221∣=(11)(1)−(−3)(−22)=11−66=−55D_x = \begin{vmatrix} 11 & -3 \\ -22 & 1 \end{vmatrix} = (11)(1) - (-3)(-22) = 11 - 66 = -55
  3. حساب محدد DyD_y (بتبديل عمود معاملات yy بعمود الثوابت).

    Dy=∣2111−22∣=(2)(−22)−(11)(1)=−44−11=−55D_y = \begin{vmatrix} 2 & 11 \\ 1 & -22 \end{vmatrix} = (2)(-22) - (11)(1) = -44 - 11 = -55
  4. حساب قيم xx و yy.

    x=DxD=−555=−11x = \frac{D_x}{D} = \frac{-55}{5} = -11 y=DyD=−555=−11y = \frac{D_y}{D} = \frac{-55}{5} = -11

    مجموعة الحل للنظام هي:

    S={(−11,−11)}\boxed{S = \{(-11, -11)\}}
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