How many square decimeters is 15 square centimeters equal to

15/100＝0.15

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7. Solve the equation: ① x2-2x-8 = 0 (by formula method) & nbsp; & nbsp; ② 2x2-4x + 1 = 0 (matching method) ③ (x + 1) (x + 3) = 15 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; ④ (Y-3) 2 + 3 (Y-3) + 2 = 0
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