2X^2-3yx-2xy+3y^2-6x^2-3xy+2xy-y= -4x^2-6xy+3y^2-y
x^2+6x+4x+24-x^2=30
10x+24=30
10x=6
x=0,6
2t^2+4tu-2ts-ut-2u^2+us+st+2us-s^2=2t^2+3tu-ts+3us-s^2
1) 2x^{2} - 3x^{2} - 2xy + 3y^{2} - (6x^{2} + 3xy - 2xy - y^{2}) = 2x ^{2} - 3xy - 2xy + 3y^{2} - (6x^{2} + xy - y^{2}) = 2x^{2} - 3xy - 2xy + 3y^{2} - 6x^{2} - xy + y^{2} = - 4x^{2} - 6xy + 4y^{2}
2) x^{2} + 6x + 4x + 24 - x ^{2} = 30
10x + 24 = 30
10x = 6
x = 3/5 = 0.6
3) 2t^{2} - 4tu - 2st - tu - 2u^{2} + su + st + 2su - s^{2} = 2t^{2} + 3tu - st - 2u^{2} + 3su - s^{2}
2X^2-3yx-2xy+3y^2-6x^2-3xy+2xy-y= -4x^2-6xy+3y^2-y
x^2+6x+4x+24-x^2=30
10x+24=30
10x=6
x=0,6
2t^2+4tu-2ts-ut-2u^2+us+st+2us-s^2=2t^2+3tu-ts+3us-s^2
1) 2x^{2} - 3x^{2} - 2xy + 3y^{2} - (6x^{2} + 3xy - 2xy - y^{2}) = 2x ^{2} - 3xy - 2xy + 3y^{2} - (6x^{2} + xy - y^{2}) = 2x^{2} - 3xy - 2xy + 3y^{2} - 6x^{2} - xy + y^{2} = - 4x^{2} - 6xy + 4y^{2}
2) x^{2} + 6x + 4x + 24 - x ^{2} = 30
10x + 24 = 30
10x = 6
x = 3/5 = 0.6
3) 2t^{2} - 4tu - 2st - tu - 2u^{2} + su + st + 2su - s^{2} = 2t^{2} + 3tu - st - 2u^{2} + 3su - s^{2}