r uchun yechish
r=9
Baham ko'rish
Klipbordga nusxa olish
r+4r-20=2r+7
4 ga r-5 ni ko'paytirish orqali distributiv xususiyatdan foydalanish.
5r-20=2r+7
5r ni olish uchun r va 4r ni birlashtirish.
5r-20-2r=7
Ikkala tarafdan 2r ni ayirish.
3r-20=7
3r ni olish uchun 5r va -2r ni birlashtirish.
3r=7+20
20 ni ikki tarafga qo’shing.
3r=27
27 olish uchun 7 va 20'ni qo'shing.
r=\frac{27}{3}
Ikki tarafini 3 ga bo‘ling.
r=9
9 ni olish uchun 27 ni 3 ga bo‘ling.
Misollar
Ikkilik tenglama
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometriya
4 \sin \theta \cos \theta = 2 \sin \theta
Chiziqli tenglama
y = 3x + 4
Arifmetik
699 * 533
Matritsa
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simli tenglama
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Differensatsiya
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Oʻngga
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Chegaralar
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}