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determinati 18xy stiind ca 18xy 20 461 si 5 se poate forma o proportie

Răspuns :

18xy=1000+800+10x+y
[tex] \frac{1000+800+10x+y}{20} = \frac{461}{5} [/tex]
(1000+800+10x+y)*5=461*20
(1800+10x+y)*5=9220

1000+800+10x+y=1844
10x+y=44
x=4
y=4
18xy=1844