Toán Lớp 8: 1 x^2-2x+7
2 x^2+x+2
3 4x^2-6x+9 ( giup em voi )
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Toán Lớp 8: 1 x^2-2x+7
2 x^2+x+2
3 4x^2-6x+9 ( giup em voi )
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