Whakaoti mō r
r=9
Tohaina
Kua tāruatia ki te papatopenga
r+4r-20=2r+7
Whakamahia te āhuatanga tohatoha hei whakarea te 4 ki te r-5.
5r-20=2r+7
Pahekotia te r me 4r, ka 5r.
5r-20-2r=7
Tangohia te 2r mai i ngā taha e rua.
3r-20=7
Pahekotia te 5r me -2r, ka 3r.
3r=7+20
Me tāpiri te 20 ki ngā taha e rua.
3r=27
Tāpirihia te 7 ki te 20, ka 27.
r=\frac{27}{3}
Whakawehea ngā taha e rua ki te 3.
r=9
Whakawehea te 27 ki te 3, kia riro ko 9.
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}