唔識做呢D數呀？

1.2(2x+5)
2,e(-f+3g)
3.4f(-a+7g)
4.8x(y+z)+4(y+z)
= (8x+4)(y+z)
5.z(a+7)+2b(7+a)
=(z+2b)(7+a)
6.3c(a+3b)-8d(a+3b)
=(a+3b)(3c-8d)
7.(5a+6b)(c-d)

2007-08-01 15:43:01 補充：
8.(4-2)(b-c)

第八題
2(b-c)(2b-2c-1)

其實呢啲數真係好簡單,係數學嘅最基本,有唔識最好請教下老師,上嚟問係得好答案,但係唔會令你識做,到考試一樣會唔識,所以都係搵老師解決問題啦~

因式分解不難, 但不保証以下答案百分百準確, 希望幫到你!

1) 4x+10
= 2(2x+5)

2) -ef+3eg
= -e(f-3g)

3) -12af-28gf
= -4f(3a+7g)

4) 8xy+8xz+4y+4z
= 8x(y+z)+4(y+z)
= (y+z)(8x+4)

5) az+14b+2ab+7z
= az+2ab+14b+7z
= a(z+2b)+7(2b+z)
= (z+2b)(a+7)

6) 3ac-8ad+9bc-24bd
= 3ac+9bc-8ad-24bd
=3c(a+3b)-8d(a+3b)
=(a+3b)(3c-8d)

7) 5a(c-d)+6b(c-d)
=(c-d)(5a+6b)

8) 4(b-c)^2-2(b-c)
= 是否打錯字(^)不知道你寫什麼