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a/ Các tai đối nhau là tia Ox và tia Oy
b/ Khi đó, A và B nằm khác phía đối với điểm O
Từ đó suy ra điểm O nằm giữa 2 điểm A và B
c/ Vì điểm O nằm giữa 2 điểm A và B ( câu a ) suy ra OA + OB = AB
Thay OA = 3cm ; AB = 6cm ta được :
3 + OB = 6
suy ra OB = 6 - 3
suy ra OB = 3 ( cm )
Mà OA = 3 cm
suy ra OA = OB
Vì OA = OB và O là điểm nằm giữa 2 điểm A và B
nên O là trung điểm của đoạn thẳng AB
Vậy :.....
Nhớ k cho mình nhé! Thank you!!!
a/ Các tai đối nhau là tia Ox và tia Oy
b/ Khi đó, A và B nằm khác phía đối với điểm O
Từ đó suy ra điểm O nằm giữa 2 điểm A và B
c/ Vì điểm O nằm giữa 2 điểm A và B ( câu a ) suy ra OA + OB = AB
Thay OA = 3cm ; AB = 6cm ta được :
3 + OB = 6
suy ra OB = 6 - 3
suy ra OB = 3 ( cm )
Mà OA = 3 cm
suy ra OA = OB
Vì OA = OB và O là điểm nằm giữa 2 điểm A và B
nên O là trung điểm của đoạn thẳng AB
Vậy :.....