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Cho doan thang AB dai 13 cm, lay diem M nam giua A va B, biet MB-MA = 5 cm. Tinh do dai cua MA va MB
bài này thì dễ thui
nhưng mk ko thick làm toán hình cho lắm
mà bây giờ mk chán quá à
chả có ai nói chuyện cùng
ai kb với mk ko???
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a) Vì O thuộc đường thẳng xy, nên O nằm giữa x, y
Vì điểm A thuộc tia Ox, B thuộc tia Oy nên tia Ox, Oy là hai tia đối nhau
⇒O nằm giữa A và B
⇒OA+OB=AB
⇒3+9=AB
12=AB⇒AB=12 (cm)
Vì C; B nằm trên tia Oy mà OC<OB (1<9)
suy ra C nằm giữa O và B
⇒OC+BC=OB
⇒1+BC=9
⇒BC=9−1=8⇒ (cm)
b) Vì M là trung điểm của BC
⇒ CM=BC:2=8:2=4 (cm)
Vì O; C; M nằm trên tia Oy mà OC<CM (1<4)
⇒ OC+CM=OM
⇒ 1+4=OM
5=OM ⇒ OM=5 (cm).
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MA= 4cm
MB=2cm