Mathematics
Junior High
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求解 國二數學
5.琪琪向上去一顆棒球,設x秒後離地面高度為(−2x²+15x+27公尺,則幾秒後棒球
回到地面?
(A) 12
(B)9 (C)6
(D)3
二、填充題:每格5分,共65分
日月比宵多4公尺,則:
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