Toán Lớp 8: tìm x, biết 5x^2-45=0 ta được:
a)x=9 b)x=3 c) x=3; x=-3 d) x=-3
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Toán Lớp 8: tìm x, biết 5x^2-45=0 ta được:
a)x=9 b)x=3 c) x=3; x=-3 d) x=-3
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