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QTeeW
a fost răspuns

5a=4b;9b=5c
2a+3b+4c=590
=>a,b,c=?
e din lectia Direct proportionalitate si din invers proportionalitate

Răspuns :

Capsunica35
5a=4b       a=4b/5
9b=5c      c=9b/5
2a+3b+4c=590
2*4b/5+3b+4*9b/5=590
8b/5+15b/5+36b/5=590
59b/5=590
b=590*5:59
b=2950/59=50
b=50
a=4b/5=4*50/5=200/5=40
a=40
c=9b/5=9*50/5=450/5=90
c=90

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