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Cho f(x)u003d 2x^2+(x+2)x+m 4
Cho f(x)u003d 2x^2+(x+2)x+m 4 pictures 5
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Cho f(x)u003d 2x^2+(x+2)x+m 4
Cho f(x)u003d 2x^2+(x+2)x+m 4
