a)Cho vi du ve 1 don thuc ,1 da thuc nhung khong phai la don thuc ,2 don thuc dong dang voi nhau ,da thuc 1 bien
b)Hay viet 1 don thuc dong dang voi don thuc don thuc xy\(^3\) sao cho tai x=-1 y=2 gia tri cua don thuc do la so nguyen duong nho hon 10
Trong cac cau sau day , cau nao dung , cau nao sai ?
a) Neu a la so nguyen thi a cung la so thuc .
b) Chi co so 0 khong la so huu ti duong va cung khong la so huu ti am .
c) Neu a la so tu nhien thi a khong phai la so vo ti .
Cho goc AOB=80° va AOC=40°.Ve tia OE nam giua hai tia OA va OB sao cho BOE=60°.Tia OE co phai la tia phan giac khong?Vi sao?
cho x,y,z la 3 so thuc tuy y thoa man x+y+z=0 va -1< x<1,-1<y<1,-1<z<1.chung minh rang da thuc x^2+y^4+z^6 co gia tri khong lon hon 2
cho don thuc 3(a+1/a)x^4y^2 voi a la hang so ,a khac 0
a)tim a de da thuc luon khong am voi moi x,y
b)tim a de da thuc luon khong duong voi moi x,y
AN VA BINH NHIN LEN BAU TROI THAY TRANG HINH LUOI LIEM. BINH NOI DO LA HIEN TUONG NGUYET THUC, NHUNG AN QUA QUYET LA KHONG PHAI. NEU AN DUNG THI THEO CAC BAN , AN DA CAN CU VAO DAU? VI SAO?
GIUP MINH VOI, AI NHANH MA DUNG THI MINH TICK CHO 3 CAI
Cho hai duong thang xx' va yy' cat nhau tai O. Goi Oa la tia phan giac cua xOy. Ke tia Ob vuong go cOa (tia Ob nam trong goc yOx'). Ke Oa' la tia doi cua tia Oa.
a) Oa' co la tia phan giac cua x'Oy' khong? Tai sao?
b) Ob co phai la tia phan giac cua x'Oy khong? Tai sao?
Mot nguoi di tu ngoai dong ve nha . Anh ta gap mot dan co va noi ;'Chuc suc khoe 100 chu co'' Nhung con co dau dan noi :''Khong chung toi khong phai la 100 chu co dau . Nhung neu nhap them mot dan bang dan nay , roi them mot nua dan nay , cung 1/4 dan nay nua va dem ca anh thi con so nay du 100. hoi dan co co bao nhieu con ?????????????????????
a) Xac dinh he so m de da thuc A(x) = mx2_2x co nghiem la 3
b) Chung to da thuc sau khong co nghiem
B(x) = x2+4x+10