Các câu hỏi tương tự
giai chi tiet giup minh may bai nay nha . minh cam on nhiu
1. cho hinh thang can ABCD (AB song song CD) . ke duong cao AE cua hinh thang. Biet AB=15 cm, CD =26 cm. Do dai doan DE la ? cm
2.gia tri cua x3+y3-9x-54=0
3. tu 0 den 6 co the viet duoc bao nhieu chu so tu nhien co 2 chu so khac nhau
4. voi moi x, gia tri cua bieu thuc (x+1)3-(x+1)3+6(x+1)(x-1)
cho hinh thang can ABCD(AB//CD,AB<CD)ke cac duong cao AE, BF cua hinh thang chung minh rang DE=CF
cho hinh thang can abcd (ab song song cd và ab<cd)canh ben dai 1 cm goc tao boi day lon va canh ben co so do bang 60 do cd=2,7 cm tinh do dai ab
BAI1Cho tam giac deu ABC .Diem M nam trong tam giac do.Qua M ke duong thang song song voi AC va cat BC o D,ke duong thang song song voi AB va cat AC o D,ke duong thang song song voi BC va cat AB o F.CMRa,BFMD,CDME,AEMF LA CAC HINH THANG CANb,goc DMEgoc EMFgoc DMFc,Trong ba doan thang MA,MB,MC doan lon nhat nho hon tong hai doan kiaBAI2Hinh thang can ABCD (AB//CD)co hai duong cheo cat nhau tai P,hai canh ben keo dai cat nhau tai Q .CMRPQ la duong trung truc cua hai day
Đọc tiếp
BAI1
Cho tam giac deu ABC .Diem M nam trong tam giac do.Qua M ke duong thang song song voi AC va cat BC o D,ke duong thang song song voi AB va cat AC o D,ke duong thang song song voi BC va cat AB o F.CMR
a,BFMD,CDME,AEMF LA CAC HINH THANG CAN
b,goc DME=goc EMF=goc DMF
c,Trong ba doan thang MA,MB,MC doan lon nhat nho hon tong hai doan kia
BAI2
Hinh thang can ABCD (AB//CD)co hai duong cheo cat nhau tai P,hai canh ben keo dai cat nhau tai Q .CMR
PQ la duong trung truc cua hai day
cho ABCD, biet rang AD=5, cac canh day AB=6 CD=14 ke AH, BK la duong cao hinh thang. 1, cm DH=CK. 2, tinh chieu cao hinh thang ABCD
cho hinh thang can ABCD co day nho AB, AH la duong cao cua hinh thang (H thuoc DC), E la trung diem cua canh BC. Goi M, N lan luot la trung diem cua cac doan thang AE ca DE, goi I la giao diem cua DM va AN. CM EI=2/3HC
Cho hinh thang vuong ABCD ,goc A=goc D=90 do, AB<CD,duong thang qua A song song vs BC cat CD tai E
A) Chung minh rang Sabce=AD×AB
B)Tinh dien tich hinh thang ABCD,biet AB=4cm,BC=10cm,CD=12 cm
VE HINH GIUM MIK NHE!!!!!!
cho hinh thang can abcd co (ab//cd) co bdc=45 . goi o la giao diem cua ab va cd a) cm tam giac doc vuong can b) tinh dien tich cua hinh thang abcd, biet bd=6 cm
Cho hinh thang abcd (ab song song voi cd )biet ab = 3cm , ad = 10 cm goi m la trung diem cua canh bc. chung minh AM vuong goc voi DM