Răspunsuri

2014-06-13T13:28:40+03:00
A²+b²=41
2ab=40
a²+b²+2ab=81
(a+b)²=9²
a+b=+-9
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2014-06-13T13:51:31+03:00

x²+y²=41

2xy=40

(x+y)²=x²+2xy+y²

(x+y)²=41+40

(x+y)²=81

x+y=√81

⇒x+y=9


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