205. Розв'яжіть рiвняння: 1) (x+y)² +(x-1)² = 0; 2) (x− 2y + 1)² + x² − 6xy+9y² = 0; 3) |x+3y−5+ (7x−6y+4)² = 0; 4) x² + y² - 4x + бу+13=0; 5) x² + y² +8x−18y+97=0.​
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