Chao cac gia su va cac ban.Minh co 1bai toan chua lam duoc.Nhu lan truoc,minh da dat cau hoi ve hinh hoc.Lan nay minh xin dat mot cau nua,mong moi nguoi giup minh bai toan nay :

Cho tam giac ABC vuong tai A,co goc B =60 do.

a, Tinh so do goc C va so sanh do dai 3canh cua tam giac ABC

b,Ve BD la tia phan giac cua goc ABC(D thuoc AC).Qua D ve DK vuong goc voi BC(K thuoc BC) .Chung minh:tam giac BAD=tam giac BKD

c,C/minh :tam giac BDC can va K la trung diem BC

d,Tia KD cat BA tai I.Tinh do dai canh ID biet AB=3cm(lam tron ket qua den chu so thap phan thu nhat).

     Neu ai, gia su co the tra loi duoc cau hoi nay thi xin nhan tin lai cho minh a.Minh xin cam on nhieuuuuuuuu(ve hinh nua nhe! )

Xin chao tat ca moi nguoi-minh la mot hoc sinh.len day muon hoi mot cau hoi ve toan hoc.Mong moi nguoi giup do.Cho don thuc:M=1/3xy(-3xy²)².

Thu gon M roi cho biet phan he so va phan bien cua don thuc tren.

Minh da lam duoc roi nhung minh muon len day de hoi moi nguoi lam the nao de minh khao lai ket qua cua ming co dung khong.Ban nao hay la giao vien hay la gia su nao lam duoc thi cho minh mot cau tra loi dung va chinh xac nhat gui cho minh nha.Minh cam on nguoi da giai duoc cau nay nhe.Lien he voi minh gan nhat nheeeeee!

Xin chao moi nguoi,cac gia su. MINH CO MOT BAI TOAN LOP7 CHUA LAM DUOC,XIN MOI NGUOI GIANG DAY: Cho biet tam giac AMN vuong tai A,co AM<AN. a)Cho biet tam giac AM=12cm,MN=37cm.Tinh do dai canh AN va so sanh cac goc trong tam giac AMN.  

              b)Goi I la trung diem cua AN.Tu diem I ve duong thang vuong goc voi AH tai I,duong thang nay cat MN tai diem B.Chung minh tam giac ABI=t/giac NBI

              c)Tren tia doi cua tia BA lay diem C sao choBC =BA,CI cat MN tai D.C/minh MN=3ND

 Minh xin moi nguoi chi giup,  hay lien he voi minh khi ban co cau tra loi gan nhat .Xin cam on(moi nguoi ve hinh luon a!)

Cho a,b,c,d > 0. CMR: 

1 < (a+b)/(a+b+c) + (b+c)/(b+c+d) + (c+d)/(c+d+a) + ( d+a)/((d+a+b) < 3

Minh da lam dc nua y roi ( y 1<...) con nua y con lai ( ...< 3). Cac ban giup minh lam not nua y cuoi nhe! Minh cam on! 

P/s: Minh sap phai nop bai roi, mong cac ban giup minh som nhe, khong minh se bi phat mat! Cam on rat nhiu! That ra thi cung co mot cau hoi giong nhu the nay, nhung ma nua y con lai ma minh chua biet lam lai khong giong nen cac ban giup minh chi tiet mot chut nhe!

gia tien 1 quyen vo mong la 2500 dong , 1 quyen vo day la 4000 dong . co giao da mua mot so vo mong va mot so vo day het 31000 dong . co giao nham tinh rang : neu doi so vo day dung bang so vo mong va doi so vo mong dung bang so vo day da mua thi phai tra them 3000 dong nua . hoi co giao da mua bao nhieu quyen vio moi loai ?

    CAC BAN GIAI THICH CHO MINH CAU : neu doi so vo day dung bang so vo mong va doi so vo mong dung bang so vo day da mua thi phai tra them 3000 dong nua . hoi co giao da mua bao nhieu quyen vio moi loai ?

     MINH NHAC LAI NHA . CAC BAN GIAI THICH CHO MINH CAU NAY NHA , CHU KHONG PHAI GIAI BAI TOAN 

    CAU NAY CO NGHIA LA :............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

CAC BAN DUNG LAI DI CO  DUOC KHONG ? SAO CAC BAN LAI TU HOI TU TRA LOI CHI VI MUON KIEM LIKE CO CHU . SAO CAC CAU PHAI LAM VAY ? CAC CAU LAM NHU VAY THAT BI OI . MINH KHONG MUON XUC PHAM DEN DANH DU CUA CAC CAU NHUNG CAC CAU LAM NHU VAY LA KHONG DUNG . CAC CAU MA DUNG NHUNG TRO BI OI NHU VAY THI NHUGN NGUOI TRA LOI CHAN CHINH CAC CAU HOI SE NHU THE NAO ? CAC CAU HAY DUNG LAI DI . MINH KHONG MUON GAY ROI TREN DIEN DAN VA MINH CUNG BIET CCAC BAN RAT MUON LIKE NHUNG CAC CAU LAM VAY LA LAM VIEC KHONG TOT MINH PHAI NGAN CHUYEN NAY LAI . MONG CAC CAU HIEU 

minh do cau nay thoi han trong 30 phut thoi nha ban nao tra loi dung va nhanh thi minh tick va ket ban :                                                              ban la mot nguoi dang len nui de thuc tap ( thuc tap cai gi minh cung ko biet) va ban tim thay mot cai can co hinh dau lau . ban da keo can xuong . ko may , hay dong do la mot hanh dong dai kho khien cho lu zombie bi nhot ben trong duoc thoat ra.ban phai chay tron. di cung ban la mot vi giao su gia , bac bao ve va co tro ly.chung ta se di qua mot cai cau suc ko chua qua 2 nguoi , te hon nua la troi rat toi ma chi co 1 chiec den .vi giao su da tinh rang bon zombie se duoi kip ho trong 17 phut .ban phai lam sao de moi nguoi deu qua cau an toan biet thoi gian ma ban qua cau la 1phut, giao su :10 phut , bao ve :5 phut ,co tro ly : 2 phut . hay nho rang chi co 2 nguoi qu acau cung luc ,thoi gian la 17 phut va phai cam den moi qua duoc