X=(5-y)/3
2x+7y=11
2(5-y)/3+7y=11
(10-2y)/3+7y=11
10-2y+21y=33
19y=23
y=23/19
2x или х^2 я решил 2 варинта
x -7 1.5 3
y -14 3 6
х -7 1.5 3
у 49 2.25 9
а)9*х^2*у/10 (тут все возводится)
б)<span>-2<span>√</span>а+<span>√</span>b +3<span>√</span>b =4<span>√</span>b - 2<span>√</span>а</span>
<span>в)3<span>√</span>2+<span>√</span>(16*2) - <span>√</span>(25*2)=3<span>√</span>2 + 4<span>√</span>2 - 5<span>√</span>2 = 2<span>√</span>2</span>
<span>г)<span>х+2<span>√</span>х*у +у-2<span>√</span>ху=х+у</span></span>
<span><span>2(2x+x)=-x+10
4x+x=-x+10
5x+x=10
6x=10
x=6/10
x=3/5</span></span>