1.4(x+y)²+12(x+y)+9----------------------ans:(2x-2y+3)²
2. (x-3)²-4x²----------------------ans:-3(x-1)(x+3)
幫幫手!!!
2006-12-06 4:19 am
回答 (1)
2006-12-06 4:25 am
✔ 最佳答案
1.4(x+y)²+12(x+y)+9---------- ------------ans:(2x- 2y+3)²=[2(x+y)]² + 12(x+y) + 9
=[2(x+y) + 3]²
=(2x+2y+3)²
2. (x-3)²-4x²-------------------- --ans:-3(x-1)(x+3)
=(x-3)² - (2x)²
=[(x-3) + 2x][(x-3) - 2x]
=(3x-3)(-3-x)
=3(x-1)(-3-x)
= -3(x-1)(x+3)
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061205000051KK03798