1/4-2х=64; -2х=16; -х=16/2; -х=8; х=-8
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x^2+y^2 =2
y=x
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x^2+x^2=2
y=x
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2x^2=2
y=x
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x^2=1
y=x
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x первое= +1
y первое= +1
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x второе = -1
y второе = -1
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(1;1) (-1;-1)
(√50-3√2)*√2=(√2√25-3√2)*√2=√2(5-3)*√2=2*2=4