a/b+c=c/a+b=b/c+a
theo t/c dãy tỉ số bằng nhau,ta có
a/b+c=c/a+b=b/c+a=a+b+c/b+c+a+b+c+a=a+b+c/2.(a+b+c)=1/2
Vậy A=1/2
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tim a,b,c biet\(\frac{1}{2}a=\frac{2}{3}b=\frac{3}{4}c\) va a-b=15
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Tim x biet
Bai 1: Tim cap so (x,y) biet: \(\frac{1+3y}{12}=\frac{1+5y}{5x}=\frac{1+7y}{4x}\)
Bai 2; Cho \(\frac{a}{b}\)=\(\frac{b}{c}\)=\(\frac{c}{a}\)va a,b,c khac ; a=2012. tinh b,c
Bai 3: tim cac so x,y,z biet :
\(\frac{y+x+1}{x}\)=\(\frac{x+z+2}{y}\)=\(\frac{x+y-3}{z}\)=\(\frac{1}{x+y+z}\)
Bai 4: Tim x, biet rang:\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
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Tim a,b,c biet \(\frac{a}{2}\)= b = \(\frac{c}{3}\)va a - 2b + c =210