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