Toán Lớp 8: 1.x ²-9y ²-2x+6y
2.x ²-(y ²+2y)x+3y ²(y-1)
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Toán Lớp 8: 1.x ²-9y ²-2x+6y
2.x ²-(y ²+2y)x+3y ²(y-1)
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