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Hai Huyen hasn't added any friends yet.
02-10-2015 - 22:15
sin6x + 2 = cos4x
07-06-2015 - 17:27
Giải hệ $\left\{\begin{matrix} x^{2}-4xy+x+2y=0 & \\ x^{4}-8x^{2}y+3x^{2}+4y^{2}=0 & \end{matrix}\right.$
07-06-2015 - 17:16
Giải hệ phương trình $\left\{\begin{matrix} xy+x-7y+1=0 & \\ (x^{2}-13)y^{2}+xy+1=0 & \end{matrix}\right.$