1)3/4:5/6=9/10
2)1/1:7/6=6/7
3)9/10-6/7=63/70-60/70=3/70
{5x-2y=11; 4x-y=4;
{5x-2y=11; 4x=4+y
{5x-2y=11; x=(4+y)/4
(5(4+y))/4-2y=11
20-3y=44
-3y=24
y=-8
{y =-8; 5x-2*(-8)=11;
{y=-8; x=-1
82^2=6724
820^2=672400
8200^2= 67240000
Откуда переложить........ .... . .................. ..... ...