Whakaoti mō n
n=5
Tohaina
Kua tāruatia ki te papatopenga
-21n+49=-31-5n
Whakamahia te āhuatanga tohatoha hei whakarea te -7 ki te 3n-7.
-21n+49+5n=-31
Me tāpiri te 5n ki ngā taha e rua.
-16n+49=-31
Pahekotia te -21n me 5n, ka -16n.
-16n=-31-49
Tangohia te 49 mai i ngā taha e rua.
-16n=-80
Tangohia te 49 i te -31, ka -80.
n=\frac{-80}{-16}
Whakawehea ngā taha e rua ki te -16.
n=5
Whakawehea te -80 ki te -16, kia riro ko 5.
Ngā Tauira
whārite tapawhā
{ x } ^ { 2 } - 4 x - 5 = 0
Āhuahanga
4 \sin \theta \cos \theta = 2 \sin \theta
whārite paerangi
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Arithmetic
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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
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Whakarerekētanga
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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}