Ta có: \(\frac{b}{3}=\frac{a}{2};\frac{a}{4}=\frac{c}{9}\Rightarrow\frac{b}{6}=\frac{a}{4}=\frac{c}{9}=\frac{b^3}{216}=\frac{a^3}{64}=\frac{c^3}{729}=\frac{-1009}{1009}=-1\)
\(\Rightarrow\frac{b^3}{216}=-1\Rightarrow b^3=-216\Rightarrow b=-6\)
\(\frac{a^3}{64}=-1\Rightarrow a^3=-64\Rightarrow a=-4\)
\(\frac{c^3}{729}=-1\Rightarrow c^3=-729\Rightarrow c=-9\)
tinh a,b,c biet a-1/2=b-2/3=c-3/4 va a -2b+3c=-14
biết \(\frac{a}{2}=\frac{b}{3};\frac{a}{4}=\frac{c}{9}\)và \(a^3+b^3+c^3=-1009\).tính a,b,c
TIMA;B;C BIET A/2 =B/3 B/5 C/4 VA A-B+C=-49
tim a,b,c biet\(\frac{1}{2}a=\frac{2}{3}b=\frac{3}{4}c\) va a-b=15
Tim a,b,c biet a/3=b/8=c/5 va 2/a+3/b-c=50
Biết \(\frac{a}{2}=\frac{b}{3};\frac{a}{4}=\frac{c}{9}\) và \(^{a^3+b^3+c^3=-1009}\)
Tim cac so a, b, c, d, biet rang: a/b/c/d= 2/3/4/5 va a+b+c+d = -42
tim cac so a,b,c biet rang : a/2 = b/3 = c/4 va a + 2b -3c = -20
Cho tan giac ABC:
a) Biet A:B:C=4:7:7. Tinh goc A, goc B, goc C.
b) Biet goc A=3/5 goc B, B=1/2 goc C. Tinh goc A, goc B, goc C.