[中學] 因式分解
2
2Z -5Z +2=0
Z解出兩根
1
Z1=---
2
Z2= 2
寫成(Z-Z1)(Z-Z2)=0
2 5
成開 Z - ---Z +1=0
2
發現跟原式子少2倍...
2
只記得要把Z 前面係數為1...
不懂的該怎解釋
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