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x3-y3=19; x2*y+xy2=6

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Solución

Ha introducido [src]
x3 - y3 = 19
x3y3=19x_{3} - y_{3} = 19
          2    
x2*y + x*y  = 6
xy2+x2y=6x y^{2} + x_{2} y = 6
x*y^2 + x2*y = 6
Respuesta rápida
x1=x2y6y2x_{1} = - \frac{x_{2} y - 6}{y^{2}}
=
x2y+6y2\frac{- x_{2} y + 6}{y^{2}}
=
-(-6 + x2*y)/y^2

x31=y3+19x_{31} = y_{3} + 19
=
y3+19y_{3} + 19
=
19 + y3