Care sunt cele două numere naturale a căror suma este 28 iar unul este egal cu 2 pe 5 din celălalt
Anexe:
Răspunsuri la întrebare
Răspuns de
2
Răspuns:
x+y=28
x=2/5×y
x=2y/5
2y/5+y=28
2y+5y=140
7y=140
y=20
x+20=28
x=28-20=8
emanuelapostol1:
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