1) -10+2х=26
2х=36
х=18
2)7у-9=40
7у=49
у=7
{2x - 3y = 5 |*(-2)
{3x + 2y = 14 |*3
{-4x - 6y = -10
{9x + 6y = 42
Прибавим уравнения
-4x + 9x = -10 + 42
5x = 32
x = 6.4
y=2.6
Ответ: (6.4;2.6)
<span>
а) (6а+1)(6a+1)</span>
<span />б)(10х+7у)(10х-7у)
<span>в)(5х-2у)(25х<span>²+10ху+4у<span>²</span></span>)</span>
<span>г)(у3+1</span><span>)(у-1)</span>