Question

Система x²+2y²=3 / x+y²=2

Answer 1

{х-2у=2 = > {x=2+2y
{3х-2у=11 => {3(2+2y)-2y=11
3(2+2y)-2y=11
6+6y-2y=11
4y=5
y=1.25
x-2*1.25=2
x=4.5
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Проверка: 4.5-2.5=2