Ответы и объяснения

2013-11-09T01:35:15+04:00


4(x + y) = 40
x + y = 10

2x = 14
x = 7
7 + y = 10
y = 3
(X-Y)(X+Y)=40
4(x + y) = 40
x + y = 10
X-Y=4
X+Y=10
2x = 14
x = 7
7 + y = 10
y = 3