-297
Объяснение:
-(x-5y)2+22xy+(3y-2x)^2 = -(x^2 - 10xy+25y^2)+22xy+ 9y^2-12xy+4x^2 =
-x^2 + 10xy-25y^2 +22xy+ 9y^2-12xy+4x^2 = 3x^2+20xy-16y^2
3*1^2 + 20*1*5 - 16*5^2 =3+100-400= -297
-297
Объяснение:
-(x-5y)2+22xy+(3y-2x)^2 = -(x^2 - 10xy+25y^2)+22xy+ 9y^2-12xy+4x^2 =
-x^2 + 10xy-25y^2 +22xy+ 9y^2-12xy+4x^2 = 3x^2+20xy-16y^2
3*1^2 + 20*1*5 - 16*5^2 =3+100-400= -297