Gọi 3 số là a, b, c
=> a+b+c=3973
và\(\frac{2a}{3}=\frac{3b}{5}=\frac{5c}{7}=\frac{30a}{45}=\frac{30b}{50}=\frac{30c}{42}=\frac{30\left(a+b+c\right)}{45+50+42}=\frac{30.3973}{137}=870\)
=> 2a=870.3 => a=1305
3b=870.5 => b=1450
5c=7.870 => c=1218
ĐS: 1305; 1450; 1218