Resposta :

AntoniLAD
2,5,4/2
1,5,2/2
1,5,1/5
1,1,1=2.2.5=20


2  5  4

10+4+5=19
   20


380/19=20

20.10=200
20.5=100
20.4=80
MATHSPHIS
1) Vamos calcular:

[tex]\boxed{\frac{1}{2}+\frac{1}{5}+\frac{1}{4}=\frac{10+4+5}{20}=\frac{19}{20}}[/tex]

2) Agora vamos dividir:

[tex]\boxed{\frac{380}{\frac{19}{20}}=380.\frac{20}{19}=400} [/tex]

3)
Agora multiplica-se:
[tex]\boxed{400.\frac{1}{2}=200} \\ \\ \\ \boxed{400.\frac{1}{5}=80} \\ \\ \\ \boxed{400.\frac{1}{4}=100}[/tex]

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