F.2既幾條MATHS,,有冇人幫到我?

2006-10-15 11:51 pm
F.2既幾條MATHS,,有冇人幫到我?


小妹讀緊F.2..有幾2條MATHS吾識做.,吾知有冇人幫到我呢?
1. 2x+7=Ax+B <--(求A&B的值)

2. 3(2B-3x)≡(1-2A)x+2(B+12) <--(求e個恆等式中常數A及B的值)

3.(x+3)(x-3) <--(展開這代數式)

4.(6-x)(6+x) <--(展開這代數式)



吾識計曬都吾緊要嫁,打你地識既出黎啦...thx+thx
更新1:

列咪式點計

回答 (4)

2006-10-16 12:01 am
✔ 最佳答案
(X+3)(X+3)
=X(X+3)+3(X+3)
=X2+3X+3X+9
=X2+6X+9


(6-X)(6-X)
=6(6-X)-X(6-X)
=36-6X-6X+X2
=X2-12X+36


(X2 = X square = X 2次方)
參考: 自己
2006-10-21 12:20 am
3. (x+3)(x-3)
=(x)^2-(3)^2
4. (6-x)(6+X)
=(6+x)(6-x)
=(6)^2-(x)^2
參考: F.2 math 書
2006-10-15 11:59 pm
1.A=2 B=7
3.x^2-9
4.36-x^2
2006-10-15 11:58 pm
1, A=2 B=7

3, x square -3x+3x-9

4,36+6x-6x-xsquare


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