(x + y + z) : 3 = 10
Vậy x + y + z = 10 x 3 = 30
Áp dụng tính chất dãy tỉ số bằng nhau , ta có:
\(\frac{x}{6}=\frac{y}{16}=\frac{z}{10}=\frac{x+y+z}{6+16+10}=\frac{30}{32}=\frac{15}{16}\)
=> x = 15/16 x 6 = 5,625
=> y = 15
=> z = 9,375
Vậy số lớn nhất trong 3 số đó là 15
Cho x<y<z la ba so doi mot nguyen to cung nhau va tao thanh mot bo ba so Py-ta-go .Biet z=41 va x chia het cho 9 . Khi do ta co x la : ......... va y la:..................
c1: Tap hop cac gia tri nguyen cua x thoa man \(\left(x+\frac{5}{4}\right)\left(x-\frac{19}{7}\right)\)<0
c2: Neu x,y la cac so nguyen thoa man 2xy+4y=6 thi y co the nhan nhung gia tri nam trong tap hop nao
c3: tim 3 so x,y,z biet x+y=8,x+z=10,y+z=12
C4: Gia tri cua x thoa man (x+3)^2=25 va x^3>0 la x=
cau 1: Cho A= \(\frac{100^{2014}+2}{3}-\frac{100^{2015}+17}{9}.\)tong cac cua so cua B=-9A
Cau 2: So sanh A=\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+........+\frac{1}{100.101}\)voi 1 ta doc A....1
Cau 3 : Cho bon so a,b,c,d sao cho a+b+c+d khac 0 . Biet \(\frac{b+c+d}{a}=\frac{c+d+a}{b}=\frac{d+a+b}{c}=\frac{a+b+c}{d}=k\). Vay k=
Cau 4 : so cac so nguyen am x thoa man \(x^{2015}=\left(-2\right)^{2014}\)
Cau 5; tim x,y,z biet \(\frac{x}{y}=\frac{10}{9},\frac{y}{z}=\frac{3}{4}\)va x-y+z=78
Cau 6: tap hop cac so co ba chu so chia het cho 18 va tong cac chu so ti le voi 1;2;3 la
Cau 7: gia tri cua tong S=1.2+2.3+.....+49.50 la S=
Cho x ; y ; z ; t : CM : \(M=\frac{x}{x+y+z}+\frac{y}{x+y+t}+\frac{z}{y+z+t}+\frac{t}{x+z+t}\)co gia tri khong phai la so tu nhien
cho 3 so nguyen duong ty le lan luot voi cac so 2;3 va 5 biet hieu cua so lon nhat va so be nhat trong ba so do la 24 so lon nhat trong ba so do la : ............
Chox,y,z la cac so duong.Chung minh rang:\(\frac{x}{2x+y+z}+\frac{y}{2y+z+x}+\frac{z}{2z+x+y}\le\frac{3}{4}\)
Cho ba so x, y, z biet \(x-y+z=3\)va \(\frac{x}{2}=\frac{y}{1}=\frac{z}{4}\). Khi do y= ?
cmr
M=\(\frac{x}{x+y+z}+\frac{y}{x+y+t}+\frac{z}{y+z+t}+\frac{t}{x+z+t}\) (x,y,z,t\(_{\in}\) \(ℕ^∗\) ) co gia tri khong phai la so tu nhien
Cho ba so x ; y ; z co tong khac 0 thoa man \(\frac{x}{y}=\frac{y}{z}=\frac{z}{x}.\)Tinh \(\frac{x^{123}.y^{456}}{z^{579}}\)
