a/18 = 4/3 => a.3 = 18.4 => a = 18.4:3 = 24
20/b = 4/3 => b.4 = 20.3 => b = 20.3:4 = 15
c/21= 4/3 => c.3 = 21.4 => c = 21.4:3 = 28
Vậy a = 24; b = 15; c = 28.
\(\frac{a}{18}=\frac{4}{3}\Rightarrow3.a=18.4\Rightarrow a=24\)
\(\frac{24}{18}=\frac{20}{b}\Rightarrow24.b=20.18\Rightarrow b=15\)
\(\frac{20}{15}=\frac{c}{21}\Rightarrow15.c=20.21=28\)
Vậy a=24;b=15;c=28
Tìm a, b, c biết:
a/18 = 20/b = c/21 = 4/3
a/18 = 4/3 => 3.a = 18.4 => a = 24
24/18 = 20/b => 24b = 20.28 => b = 15
20/15 = c/21 => 15.c = 20.21 = 28
