a) Ta có $\frac{x}{1}=\frac{y}{2}=\frac{z}{2}=\frac{x+y+z}{5}=\frac{25}{5}=5$
Suy ra x = 5; y = 10; z = 10.
b) Ta có $\frac{a}{3}=\frac{b}{4}=\frac{c}{5}=\frac{a+b-c}{2}=\frac{100}{2}=50$
Suy ra a = 150; b = 200; c = 250.
a) Ta có $\frac{x}{1}=\frac{y}{2}=\frac{z}{2}=\frac{x+y+z}{5}=\frac{25}{5}=5$
Suy ra x = 5; y = 10; z = 10.
b) Ta có $\frac{a}{3}=\frac{b}{4}=\frac{c}{5}=\frac{a+b-c}{2}=\frac{100}{2}=50$
Suy ra a = 150; b = 200; c = 250.