Răspuns :

Grijamaximaid

Explicație pas cu pas:

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Vezi imaginea Grijamaxima
Davidcristian1551id

1)a+b+c=100

a,b,c d.p. 1,2,7

a*1=b*2=c*7=k

a=k

2b=k=>b=k/2

7c=k=>c=k/7

k+k/2+k/7=100

aduci la acelasi numitor

14k+7k+2k=1400

23k=1400=>k=1400/23

a=1400/23

b=700/23

c=200/23

2)a+b+c=190

a*2=b*4=c*5=k

a=k/2

b=k/4

c=k/5

k/2+k/4+k/5=190

aduci la acelasi numitor

10k+5k+4k=3800

19k=3800=>k=3800/19=200

a=100

b=50

c=40

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