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nguyenvudn
2 năm trước
Giải pt nghiệm nguyên `x^2+4y^2=196` Đừng làm theo cách này nha mọi người: `x^2+4y^2=196` `⇔x^2=196-4y^2 ≥0` Xét: `196-4y^2≥0` ` ⇔4y^2 ≤196` ` ⇔y^2 ≤49` ` ⇒...` Em cảm ơn
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