Sos.1:x^2-3xy-10y^2;(交叉十字相乘)2:ab(c^2+d^2)+cd(a^2+b^2)
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Sos.1:x^2-3xy-10y^2;(交叉十字相乘)2:ab(c^2+d^2)+cd(a^2+b^2)
Sos.
1:x^2-3xy-10y^2;(交叉十字相乘)
2:ab(c^2+d^2)+cd(a^2+b^2)
Sos.1:x^2-3xy-10y^2;(交叉十字相乘)2:ab(c^2+d^2)+cd(a^2+b^2)
x -5y
x 2y
(x-5y)(x+2y)
abc^2+abd^2+a^2cd+b^2cd
bc(ac+bd)+ad(bd+ac)
=(bc+ad)(ac+bd)