aflari nr x si y stiind ca x+ y = 72 iar x- y= 18

Răspunsul a fost dat de: USER1462
29 Agustus 2025 matematica 5 minute
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Întrebare

Clasă: Education Materie: matematica
aflari nr x si y stiind ca x+ y = 72 iar x- y= 18
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Cel mai bun răspuns
(77)
se aduna cele doua relatii
x+y+x-y=72+18
2x=90
x=90:2=45
Răspunsul a fost dat în data 29 Agustus 2025
(137)
x+y=72; x-y=18 => x= y+18;
y+18+y=72; 2y=72-18; 2y= 54: /2; y=27;
x+27=72; x=72-27;
x=45;
45+27=72;
45-27=18.
Răspunsul a fost dat în data 29 Agustus 2025

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