<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^n*3*(n+1) = 2^n*3*3^n = 3*6^n
a^m^a^n = a^(m+n)
1целая1/3*1,2=1,6
3/5+1,6=2,2