Предмет: Алгебра, автор: Befre

Система
х-2у=1
ху+у=12

Ответы

Автор ответа: labanka
0
x=1+2y
Подставляем во второе уравнение вместо х
(1+2y)*y+y=12
2y^2+y+y=12
2y^2+2y-12=0
D=4+4*2*12=100
y1,2=(-2+10)/4
y1=2
x=5

y2=-3
x=-5
Ответ:(5,2)(-5;-3)
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1) Прочитай текст (1-3) и найди соответствия с заголовками (A-C).

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1. The Earl’s of Sandwich servant invented … .

2. In Victorian England it was a tradition … .

3. The sandwiches are a typical “snack” meal because … .

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Present Simple Tense______________

Past Simple Tense ________________

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