169-X^2=69
-x^2=69-169
-x^2=-100
x^2=100
x=+-√100
x=+-10
x=-10
x= 10
Ответ: x1=-10 ; x2=10
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169-X^2=69
-x^2=69-169
-x^2=-100
x^2=100
x=+-√100
x=+-10
x=-10
x= 10
Ответ: x1=-10 ; x2=10