Cau 5: Trong cac khang dinh sau, khang dinh nao dung, khang dinh nao sai?
1.Ba diem phan biet la ba diem thang hang.
2.Voi ba diem phan biet luon co hai diem nam ve cung phia doi voi diem con lai.
3.Voi ba diem thang hang phan biet luon co hai diem nam khac phia voi diem con lai.
4.Voi ba diem A,B,C thang hang thi diem B luon nam giua hai diem A,C.
5.Co mot va chi mot duong thang di qua hai diem (phan biet) cho truoc.
6.Hai duong thang phan biet thi song song voi nhau.
7.Hai tia chung goc thi cung nam tren mot duong thang.
8.Hai tia chung goc thi doi nhau
9.Neu diem M nam giua diem A,B thi no la trung diem cua doan thang AB.
10.Neu MA=MB thi M la trung diem cua doan thang AB.
11.Neu MA+MB= AB va MA=MB thi M la trung diem cua doan thang AB.
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1) Cho hai doan thang AC.BD cat nhau tai I. Phat bieu nao sau day?
A) Goc BAC va DIC dong vi B) Goc ADB va CBD so le trong
C) Goc BAC va ACD so le trong D) Goc CAD va ACB so le trong
2) Cho tam giac ABC co BAC=90 do. Qua B dung duong thang b vuong goc voi AB va qua C dung duong thang c vuong goc voi AC. Phat bieu nao sau day la sai?
A) b va c cat nhau B) AB//c C) AC//b D) Ca A,B,C deu sai
3) Cho hai duong thang song song a,b. Mot duong thang c vuong goc voi ca hai duong thang a va b. Goi d la mot duong thang bat ky. Phat bieu nao sau day la dung?
A) Neu d khong co diem chung voi a thi cung khong co diem chung voi b
B) Neu d cat a thi d cung cat b
C) Neu d vuong goc voi a thi d song song voi c
D) Ca ba paht bieu tren deu dung.
4) Cho ba diem M,N,P khong thang hang. Phat bieu nao sau day sai?
A) Chi co mot duong thang di qua M va song song voi NP B) Co mot tam giac MNP
C) Chi co mot duong thang di qua M va vuong goc voi NP D) Tat ca deu sai
5) Cho biet hai duong trung truc cua hai doan thang AB va CDD cat nhau tai O. Trong cac cau sau, cau nao dung:
A) AB//CD B) AB\(\perp\)CD C) AB va CD cat nhau D) Tat ca deu sai
Câu 1: B
Câu 2: D
Câu 3: D
Câu 4: D
Câu 5: D
tren duong thang xy lay them 2012 diem M1, M2,M3,..,M2012 phan biet voi nhau va phan biet voi cac diem A, B,O,I co the ve duoc bao nhieu goc dinh C ma cac canh la cac tia goc C va di qua cac diem da cho tren duong thang xy
doc cau ca dao sau va tra loi cau hoi
ai oi giu chi cho ben
du ai xoay huong doi nen mac ai
em hay nhan xet cau ca dao nay dc sang tac ra de lam j ? no muon noi len van de chu de j ? hai cau 6 va 8 lien ket voi nhau nhu the nao ve luat tho va ve y ? nhu the da bieu dat tron ven 1 y chua ? theo e , cau ca dao do da coi la mot van ban chua ?
loi phat bieu cua thay co hieu truong trong le khai giang nam hoc co phai la mot van ban ko / vi sao ?
buc thu em viet cho ban be hay nguoi than co phai la mot van ban ko ?
nhung don xin hoc , bai tho , truyen co tich ( ke mieng hay dc chep lai ) , cau doi , thiep moi du dam cuoi ,.... co phai deu la van ban ko ? hay ke them nhung van ban ma e biet
câu ca dao dung để khuyên
chủ đề giữ chí kiên định
2 câu thơ lục bát liên kết với nhau về vần en
2 về cầu đã diễn đạt trọn vẹn 1 ý
đây là 1 văn bản
có phải là văn bản: có chủ đề, có liên kết,bố cục rõ ràng, mach lac
còn lại tự làm nhé ~ hc tốt ~
bai 1:Cho duong tron tam O, day AB. cac tiep tuyen ke tu A,B cat nhau tai C. ke day CD cua duong tron co duong kinh OC(D khac A,B). CD cat cung nho AB cua (O) tai E (E nam giua C va D).Chung minh:
a/goc BED= goc DAE
b/DE^2=DA*BD
bai 2:Cho tam giac ABC deu noi tiep duong tron tam O. M la diem nam tren cung nho AB. chung minh:
a/MB+MA=MA
b/ke MH vuong goc voi BC, MI vuong goc voi AB, MK vuong goc voi AC. chung minh 3 diem H,I,K thang hang
1 the nao la van ban?cac kieu van ban thuong gap voi cac phuong thuc bieu dat tuong ung?
2 phuong thuc tu su?dan y chung bai van tu su?
3 khi ke nguoi ke viec trong bai van tu su chu y den dieu gi?
4 doan van-moi quan he giua cau chu de va cac khac trong doan van
5 cac thu tu ke thuong gap trong van tu su
6 the nao la ke chuyen tuong tuong
7 the nao la ngoi ke?vai tro dac diem cua moi ngoi ke trong van tu su
ai tra loi nhanh cac cau hoi va dung thi minh se cho mot tick
Câu 1 :
Văn bản là một phương tiện để ghi nhận, lưu giữ và truyền đạt các thông tin, quyết định từ chủ thể này sang chủ thể khác bằng một ký hiệu hay ngôn ngữ nhất định nào đó.
Ung voi khoi luong muoi do thì can bao nhieu mol NaCl de tra loi cau hoi nay chung ta can biet den cong thuc nao. Hay giai thich cac dai luong trong cong thuc do va khai trien cong thuc do co tinh tuong duong. Nhom ban co "tips" nao de giup cac ban trong lop de nho cong thuc hay khong (cang nhieu "tips" cang tot)
minh ten la khanh , cac cau hay giup minh bai nay nhe
mot ong gia ong di len rung gap mot cay chuoi do hoi tai sao ong ay lai chay ve?
tuy day khong co gi noi ve toan nhung minh rat vui khi lam quen voi cac cau!
minh rat la nhut nhat .Nhung mong cac ban hay lam quen voi minh !
neu cac ban biet thi hay gui lai va neu muon lam quen voi minh thi hay nhan cung cau tra loi 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!
Ta có M =\(\dfrac{1}{3}xy\left(-3xy^2\right)^2\)=\(\dfrac{1}{3}xy.9x^2y^4\)=3\(x^3y^5\).Do đó phần hệ số là 3 và phần biến là \(x^3y^5\)
