• 2022-05-27
    判断下列集合对所给的二元运算是否封闭. [br][/br]全体[tex=2.429x1.071]fYRl1cpBZV0k8ULAvI7FIg==[/tex] 实矩阵集合[tex=3.071x1.357]FvVdeF29yC+Nf//tT6N+GXawKHg4GD7gxmD38JWxakM=[/tex]和矩阵加法及乘法运算,其中[tex=2.714x1.143]VIAETkOIJHidy5tnBH3PrBhpI7VspdiEbfRjo6JvIA0=[/tex]