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Troi dat oi ! Co ai giup toi khong aaaaaaaa
dfhierjpoijvgbopfkhjoghjyuhkiuhkihuo
yuiuhi | ihuohuio | ikhioijoo | oljiljioijojo | uojijoijoio | jiojiiojioljojil | jklokjlooioljiloj |
---|---|---|---|---|---|---|
iojiojio | jioljiljiojijojoj | ooo | yy | huio | ho | h |
Cho doan thang AB=5cm,M bat ky thuoc doan thang AB.Goi E,F lan luot la trung diem cua MA va BM.Chung to do dai EF khong phu thuoc vao vi tri cua M tren doan thang AB
cho doan thang AB ,diem O thuoc tia doi cua tia AB .Goi M va N thu tu la trung diem cua OA,OB .Chung to rang do dai doan thang MN khong phu thuoc vao vi tri diem O, Chung minh rang OA<OB
Cho doan thang AB, Diem O thuoc tia doi cua tia AB. Goi M, N thu tu la trung diem cua OA, OB.
a) Chung to rang OA < OB
b) Trong ba diem O, M, N diem nao nam giua hai diem con lai?
c) Chung to rang do dai doan thang MN khong phu thuoc vao vi tri cua diem O(O thuoc tia doi cua tia AB)
tren doan thang AC co do dai 12 cm ,lay diem B sao cho AB=5 cm .a, tinh do dai cua doan thang BC.b,goi M,N lan luot la trung diem cua doan thang AB ,BC . tinh do dai doan thang MN.c, lay diem D thuoc tia doi cua tia CA sao cho CD =7 cm . chung to rang diem C la trung diem cua doan thang BD
Tren doan thang AC dai 12cm lay diem B sao cho AB = 5cm
a) Tinh do dai cua doan thang BC
b) Goi MN lan luot la trung diem cua cac doan thang AB, AC.Tinh do dai doan thang MN
c) Lay D thuoc tia doi cua tia CA sao cho CD = 7cm.CTR diem C la trung diem cua doan thang BC
cau 1 :ve doan thang ab = 20cm va diem C thuoc AB sao cho AC = 3/8AB.Tinh do dai cac doan AC.Lay M thuoc AB sao cho C la trung diem cua doan thang BM.Chung minh diem M ka trung diem cua doan thang AB
(mik dang can gap)
cho diem B thuoc duong thang AC \((\)B khong trung voi A va C\()\).Hai diem D,E lan luot la trung diem cua doan thang AB,AC.Chung to do dai doan thang BC gap doi do dai doan thang DE
Cho doan thang AB dai 8cm va mot diem C thuoc doan thang AB.Biet AC=4cm.
a)Diem C co phai la trung diem cua doan thang AB khong?Vi sao?
b)Goi D la trung diem cua doan thang AC.Tinh do dai doan thang BD.
cho doan thang AB bang 10cm va diem C thuoc doan thang AB. Biet AC bang 5
a, Diem C co la trung diem cua AC ko vi sao
b,Tren tia doi cua tia BC,lay D sao cho BD bang 3cm. Goi M,N,I lan luot la trung diem cua doaan thang CB, BD,MN. Tinh AI