Odpowiedzi

2010-03-28T16:04:11+02:00
4x+10y= 2 / *7
7x+15y= -3 / *4

28x+ 70y =14
28x+ 60y= -12
__________

130y= 2 /:130
y=2:130




2x+3x-y2-3y=(x-y)(x+y)
4x+3y=2