Toán Lớp 8: E = x ² – 6x + 3 ; F = 5x ² + 10x + 2015 ; C = 5x ² + 4y ² – 4xy + 10x – 12y + 2031
Tìm giá trị nhỏ nhất ( các bạn giúp mik nhé =))
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