a)Tim so nguyen x va y biet :
5/x+y/4=1/8
b)Tim so nguyen x de A co gia tri la 1 so nguyen biet :
A=(căn x +1) /(căn x -3) (x lớn hơn hoặc bằng 0)
5/ tim 2 so a va b biet 2a = 3b va a- b=8
Bai 1 :cho A(x)=2x^2-8x
tim nghiem A(x)
b,tim B(x) biet B(x)=A(x)-3x+2x^2
c,tim ngiem B(x)
Bai2
Cho ham so y=f(x)=x+1
cac diem sau diem nao thuoc do thi ham so :A(0;1).B(1/2;-1). C(-1/2;0)
a) tinh cua 1 tam giac can biet goc o day cua tam giac do bang 50 do
b)tinh goc o day cua 1tam giac can biet goc o dinh cua tam giac do bang 70 do
c)biet tam giac ABC can tai A, hay tinh so do goc B va goc C, theo so do cua goc A.
tim cac so tu nhien x , y biet :2^m+2^n=2^m+n
tim so huu ti x,y biet: (3x-30) mu 2016+/y-3/ be hon hoac bang 0
3/ tim so hoc sinh khoi 6 cua 1 truong thcs. biet so hs nu chiem \(\frac{3}{5}\) so hs khoi 6 cua truong la 162 em
bai1:tim x biet a,(x:23+45)•67
bai2:tinh nhanh a,(44•52•60):(11•13•15) b,123•456-456•123123
tim cac so nguyen nuyen duong x,y,z biet rang :
x^3-y^3 -z^3 =3xyz va x^2 =2(y+z)