f(x,y)=y根号1-x2+s f(x,y)dxdy其中D=(x,y),则
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设4阶矩阵A=(aij)不可逆,a12的代数余子式A12不等于0,为矩阵A的列向量组
Asyoulikepopmusic,__________Ilikeliterature.
TheTVstation,in________tomassivepopulardemand,decidedtocontinuethesoapopera(肥皂剧).
求二元函数f(x,y)=x3+8y3-xy的极值。
Howlong________they________(dig)theditch?