运算 1)加法; 2)数乘; 3)乘法: mxp= amxn b n×p Ci=2aikbk$Žµ 1¤\{¶ 2¤ê¦¶ 3¤¦{µ Cm×p = Am×nBn×p. cij = X n k=1 aikbkj. 3