cho hình bình hành ABCD trung khu O. CMR:
a) (overrightarrowCO) - (overrightarrowOB) = (overrightarrowBA)
b)(overrightarrowAB) - (overrightarrowBC) = (overrightarrowDB)
c)(overrightarrowDA) - (overrightarrowDB) = (overrightarrowOD) - (overrightarrowOC)
d)(overrightarrowDA) - (overrightarrowDB) + (overrightarrowDC) = (overrightarrow0)
Cho hình bình hành ABCD bao gồm tâm O. Chứng tỏ rằng :
a) (overrightarrowCO-overrightarrowOB=overrightarrowBA)
b) (overrightarrowAB-overrightarrowBC=overrightarrowDB)
c) (overrightarrowDA-overrightarrowDB=overrightarrowOD-overrightarrowOC)
d) (overrightarrowDA-overrightarrowDB+overrightarrowDC=overrightarrow0)
a) Ta có, theo quy tắc tía điểm của phép trừ:
Cho hình bình hành abcd có tâm o
b) Ta tất cả : Nơi Bán Bếp Từ Hitachi Ht-H60S, Bếp Từ Hitachi Ht
c) Ta có :
 (overrightarrow{CO}) - (overrightarrow{OB}) = (overrightarrow{BA})b)(overrightarrow{AB}) - (overrightarrow{BC}) = (overrightarrow{DB})c)(overrightarrow{DA}) - (overrightarrow{DB}) = (overrightarrow{OD}) - (overrightarrow{OC})d)(overrightarrow{DA}) - (overrightarrow{DB}) + (overrightarrow{DC}) = (overrightarrow{0})++++++++Cho+hình+bình+hành+ABCD+có+){kind=link}