Đáp án + Giải thích các bước giải:
$\widehat{e'Hd'}$ `=` $\widehat{eHd}$`.` $\\$ $\widehat{e'Hm'}$ `=` $\widehat{eHm}$`.` $\\$ $\widehat{m'Hd'}$ `=` $\widehat{mHd}$`.` $\\$ $\widehat{m'Hd}$ `=` $\widehat{d'Hm}$`.` $\\$ $\widehat{d'He}$ `=` $\widehat{e'Hd}$`.` $\\$ $\widehat{e'Hm}$ `=` $\widehat{m'He}$`.`