cho ham so y= f(x) =6/x
tinh f(1) ; f(1.5) ;f(2) ;f(3) ;f(-2/3)
tim x biet y=3 ; y=-2
tim y biet 1<x>3 ; 1.5 be hon hoac bang x lon hon hoac bang 6
diem nao trong cac diem sau day khong thuoc do thi ham s
A(-1;-6 ) ; B(-0.5 ;-12 ) ;C(-0.5 ; -13 ) ; D(-1/3 ; -3 )
C/m neu 2 tam giac co 2 canh tuong ung bang nhau tung doi 1 nhung cac goc xem giua chung khong bang nhau thi cac canh thu 3 cung khong bang nhau va canh nao doi dien voi goc lon hon thi lon hon. Ai giai dum minh di
ham so f duoc cho boi cong thuc sau f(x)=5x-4 voi x>=4/5 va 4-5x voi x<4/5 a)Hoi ham so f co the duoc viet gon boi cong thuc nao ? b)tim x de f(x)=6
viet cong thuc ham so y=f(x) biet y ti le thuan voi x theo he so ti le 1/2
a chung to rang neu x1>x2
I.Dai so:
Cau1. Gia tri tuyet doi cua so huu ti x duoc xac dinh nhu the nao?
Cau2. Viet cac cong thuc:nhan, chia hai luy thua cung co so. luy thua cua: luy thua, mot tich, mot thuong.
cau3. Ti le thuc la gi? Tinh chat co ban cua ti le thuc. Viet cong thuc tinh chat cua day ti so bang nhau.
cau4. Dinh nghia can bac hai cua mot so am? cho vi du?
Cau 5 Khi nao thi hai dai luong y va x ti le thuan voi nhau? Tinh chat cua hai dai luong ti le thuan ?
Cau 6:Khi nao thi hai dai luong y va x ti le nghich voi nhau? Tinh chat cua hai dai luong ti le nghich?
Cau 7:Do thi cua ham so y= ax ( a khac 0) co dang nhu the nao?
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 ham so \(y=f\left(x\right)=ax^2+bx+c\)(a;b;c thuoc Q)
chung to rang f(-2)*f(3) nho hon hoac bang 0, biet rang 13a+b+2c=0
tim cac so x,y,z biet x -1 phan 2 bang y cong 3 phan 4 bang z-5 phan 6 va 5z - 5x - 4y bang 50
Cac ban oi giup minh voi
tim x biet 6.4/x=x/99tim cac so nguyen biet (|x|-3)(x^2+4) be hon hoac bang 4hai dia diem a va b cach nhau 90kmhai nguoi di xe dap cung mot luc tu ava bde gap nhau va ho gap nhau cach a 50km;nhung neu nguoi di tu b di nhanh hon xuat phat truoc nguoi a 1 gio thi ho gap nhau cach a 350/9km tinh van toc moi nguoiCac giai ho minh voi minh se tick cho
Cac ban nho viet ho cach lam min voi