cho ba so duong a,b,c thoa man: a/5=b/7=c/3 va a^2+b^2-c^2=585 hoi a+b+c=
a) cho 2 stn a va b voi a<b thoa man 3(a+b) =5(a-b)
tim thuong cua 2 so
b) Tim cac so Nguyen Duong a, b, c biet rang : a3-b3-c3 =3abc va a2=2(b+c)
cho a va b duong tinh a^(2012)*b^(2013) biet a+b=a^2+b^2=a^3+b^3
cho hai so duong a;b thoa man a/5=b/6 va 2a^2-b^2 =56
khi do a+b=
so cap so duong a va b thoa man 1/a -1/b=1/a-b
Cho 3 so a,b,c khac 0 va doi mot khac nhau thoa man a^2.(b+c)=b^2.(a+c)=2015 Tinh c^2.(a+b)
Cho a,b,c la ba so thuc duong thoa man (a^2).(b+c)=(b^2).(a+c)=20172018.tinh (c^2).(a+b)
cho 3 so a, b, c va thoa man
ac=b^2; ab=c^2
hay tinh M = a^2011/b^1005.c^1006
cho a,b,c,d la 4 so khac 0 thoa man b^2 =ac va c^2=bd.Cmr\(\frac{a^3+b^3+c^3}{b^3+c^3+d^3}\)=\(\frac{a}{b}\)