cho ham so fx= x*x khi x=1 Tim a de ham so lien tuc tren R bchung minh rang phuong trinh sau co 3 nghiem phan biet.. Tim 3 so hang dau va cong sai cua csc.[r]
(1)Bai1 a) b) c) bai a) lim(x->7)(2-can(x-3)/(x*x-49)) lim(2ngu n-3 ngu n)/(3 ngu (n+2) + 2ngu n) lim(x->duong vo cung)(can bac hai(4*x*x+x) +2*x) cho ham so f(x)= x*x x<1 2*a*x-3 x>=1 Tim a de ham so lien tuc tren R b)chung minh rang phuong trinh sau co nghiem phan biet bai a) cho csc (Un) thoa man: U1+U5-U3=10 va U1+U6+17 Tim so hang dau va cong sai cua csc b) ba so co tong la 15 lap mot csc Neu lan luot cong them 1;1;4 vao so chung ta duoc so moi lap cap so nhan Tim csc da cho c) Cho tan giac ABC co goc A,B,C theo thu tu lap csn co cong boi q+2 chung minh rang :ha=hb+hc (trong ha,hb,hc tuong ung la cac duong cao ke tu A,B,C); (2)