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a fost răspuns

X+Y=28,77
X-Y=5,69

X, Y=?

Răspuns :

Mirelamisspis
x+y=28,77
x-y=5,69
28,77-5,69=23,08 (2y)
23,08:2=11,54 (y)
11,54+5,69=17,23 (x)
JustSaying
x+y=28, 77
x-y=5, 69
x=5,69+y
5,69+y+y=28,77
2y=23,08
y=23,08:2=11,54
x=5,69+12,54=17,23

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