<span>{4(y-3x)-5(y-4x)=-10
{6(x-2y)+5y=-20
{4y-12x-5y+20x=-10
{6x-12y+5y=-20
{-y+8x=-10 { y=8x+10 </span>{ y=8x+10 { y=8x+10<span>
{6x-7y=-20 {6x-7(8x+10)=-20 {6x-56x-70=-20 {-50x=50
</span>{y=8x+10 {y=-8+10 {y=2
{x=-1 {x=-1 {x=-1
ответ (-1;2)
2√2+√50-√98=2√2+√25*2-√49*2=2√2+5√2-7√2=7√2-7√2=0
(2в-6)(6в+2)-6в(2в+6)=12в²-36в+4в-12-12в²-36в=-68в -12= -68*2,7-12=
=-183,6-12=-195,6