1. Cho hai goc ke widehat{AOB} va widehat{BOC} co tong so do cua hai goc la ^{140^0} biet widehat{AOB} co so do lon hon so do cua goc widehat{BOC} la ^{20^0}
a, Tinh widehat{AOB,}widehat{BOC}
b, Ve tia phan giac Om cua widehat{AOB}, tia phan giac On cua widehat{BOC}. Tinh widehat{mOn}.
Đọc tiếp
1. Cho hai goc ke \(\widehat{AOB}\) va \(\widehat{BOC}\) co tong so do cua hai goc la \(^{140^0}\) biet \(\widehat{AOB}\) co so do lon hon so do cua goc \(\widehat{BOC}\) la \(^{20^0}\)
a, Tinh \(\widehat{AOB,}\widehat{BOC}\)
b, Ve tia phan giac Om cua \(\widehat{AOB}\), tia phan giac On cua \(\widehat{BOC}\). Tinh \(\widehat{mOn}\).
