<span>1/4(2y+1)=8
0,5у+0,25=8
0,5у=8-0,25
0,5у=7,75 / 0,5
у=15,5 - корень уравнения
Ответ:у=15,5.
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A) {x+2y–3=0
{x+y+1=0
{x=3–2y
{3–2y+y+1=0
–y=–4
y=4
x=3–2•4=–5
Ответ: (–5;4)
В) {4х+у–2=0
{3х+у+3=0
{у=2–4х
{3х+2–4х+3=0
–х=–5
х=5
у=2–4•5=–18
Ответ: (5;–18)
7.
8.
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x∈[-7/6; -1)