已知二次型-|||-((x)_(1),(x)_(2),(x)_(3))=2({x)_(1)}^2+3({x)_(2)}^2+3({x)_(3)}^2+2a(x)_(2)(x)_(3)(agt 0),-|||-通过正交变换化为标准形 =({y)_(1)}^2+2({y)_(2)}^2+5({y)_(3)}^2, 求参数a及所用的正交变换矩阵.

29.已知二次型 =2({x)_(1)}^2+3({x)_(2)}^2+3({x)_(3)}^2+2a(x)_(2)(x)_(3)(agt 0) 经正交变换 x

二次型((x)_(1),(x)_(2),(x)_(3))=2({x)_(2)}^2+3({x)_(3)}^2的秩为_______.二次型的秩为_______.

[题目]求一个正交变换 =(p)_(y), 把二次型f(x1,-|||-_(2),(x)_(3))=2({x)_(1)}^2+3({x)_(2)}^2+3(x)

28.求一个正交变换化下列二次型成标准形:-|||-(1) =2({x)_(1)}^2+3({x)_(2)}^2+3({x)_(3)}^2+4(x)_(2)(x

28.求一个正交变换化下列二次型成标准形:-|||-(1) =2({x)_(1)}^2+3({x)_(2)}^2+3({x)_(3)}^2+4(x)_(2)(x

设函数为(x)=(e)^(x^2+3)，则(x)=(e)^(x^2+3)的值为（ ）。A (x)=(e)^(x^2+3) B (x)=(e)^(x^2+3)C

22.-|||-设二次型 ((x)_(1)(x)_(2),(x)_(3))=({x)_(1)}^2+({x)_(2)}^2+({x)_(3)}^2+2a(x)_

已知二次型((x)_(1),(x)_(2),(x)_(3))=({x)_(1)}^2+a({x)_(2)}^2+({x)_(3)}^2+2b(x)_(1)(x)

求二次型 ((x)_(1),(x)_(2),(x)_(3))=4({x)_(2)}^2-3({x)_(3)}^2+4(x)_(1)(x)_(2)-4(x)_(1

二次型 ((x)_(1),(x)_(2),(x)_(3))=2({x)_(1)}^2+2({x)_(2)}^2+2({x)_(3)}^2-2(x)_(2)(x)