Răspunsuri

2014-07-13T14:45:45+03:00
X²+2xy+y²=(x+y)²= 5²=25

x²+2xy+y²-20=25-20=5
1 5 1
2014-07-13T14:49:37+03:00
x + y = 5
x² + 2xy + y² - 20 = (x + y)² - 20 = 5² - 20 = 25 - 20 = 5

1 5 1