У-2х=3
2х+3у=6
___________________
<span>(-2x+y)+(2x+3y)=3+6
-2x+y+2x+3y=9
4y=9
y=9/4
</span><span>-2x+(9/4)=3
-2x=3 - 9/4
-2x= 3/4
x= - 3/8
Ответ:(</span>- 3/8 ; 9/4)
4x-9/5=7-5x
4x-9/5=20x/5-9/5
20x/5-9/5=7-5x
5(20x-9)/5=5(7-5x)
20x-9=5(7-5x)
20x-9=35-25x
25+20x-9=(25x-25x)+35
25x+20x-9=35
45x-9=35
45x=44
x=44/45
584+583²-584²+583=584^(1-2)+583(2+1)=583³/584=198155284/584=339306 580/584= 339306 145/146