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tung2000
2 năm trước
tìm x a,(x+2).(x ²-2x+4)-x(x+3).(x+3).(x-3)=26 b,(x-3).(x ²+3x+9)-x.(x-4).(x+4)=21 c, (21-1).(4x ²+2x+1)-4x.(2x ² -3=23
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