Whakaoti mō r
r=-11
Tohaina
Kua tāruatia ki te papatopenga
7r+2=5r-20
Whakamahia te āhuatanga tohatoha hei whakarea te 5 ki te r-4.
7r+2-5r=-20
Tangohia te 5r mai i ngā taha e rua.
2r+2=-20
Pahekotia te 7r me -5r, ka 2r.
2r=-20-2
Tangohia te 2 mai i ngā taha e rua.
2r=-22
Tangohia te 2 i te -20, ka -22.
r=\frac{-22}{2}
Whakawehea ngā taha e rua ki te 2.
r=-11
Whakawehea te -22 ki te 2, kia riro ko -11.
Ngā Tauira
whārite tapawhā
{ x } ^ { 2 } - 4 x - 5 = 0
Āhuahanga
4 \sin \theta \cos \theta = 2 \sin \theta
whārite paerangi
y = 3x + 4
Arithmetic
699 * 533
Poukapa
\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]
whārite Simultaneous
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Whakarerekētanga
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Whakaurunga
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Ngā Tepe
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}