我吾明里題math..
a^3+ab+5b+5a^2
math...因式分解
2008-11-23 7:48 pm
回答 (5)
2008-11-23 8:00 pm
✔ 最佳答案
可以用分組分解法（唔知你學左未）a^3+ab+5b+5a^2 分組得
(a^3+5a^2)+(5b+ab) 提公因式得
a^2(a+5)+b(a+5) 再提公因得 (你只要將a+5代成一個未知數就得)
(a+5) (a^2+b) 由於唔係方程,所以最多做到尼到
2008-11-23 8:08 pm
a^3+ab+5b+5a^2
=(a^3+ab)+(5b+5a^2) *分開來計*
= a(^3+b)+5(b+a^2) *抽取公因式*
=(a+b)(^3+b)(b+a^2) *因式分解&答案*
=(a^3+ab)+(5b+5a^2) *分開來計*
= a(^3+b)+5(b+a^2) *抽取公因式*
=(a+b)(^3+b)(b+a^2) *因式分解&答案*
參考: 標準之答案
2008-11-23 7:56 pm
a^3+ab+5b+5a^2
= (a^3+5a^2)+(ab+5b)
= (a+5)a^2+(a+5)b
= (a+5)(a^2+b)
= (a^3+5a^2)+(ab+5b)
= (a+5)a^2+(a+5)b
= (a+5)(a^2+b)
2008-11-23 7:55 pm
首先你要排一排隊
我會咁做...
a^3+ ab +5a^2+5b
=a(a^2 +b) + 5(a^2+b)
=(a^2+b)(a+5)
我會咁做...
a^3+ ab +5a^2+5b
=a(a^2 +b) + 5(a^2+b)
=(a^2+b)(a+5)
收錄日期: 2021-04-23 18:10:06
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