F.2 factorization既數學題x7題(20點!) 快呀!!!!!!

另外2題:
factorization
1. x(a-b-5)+y(5+b-a)
=x(a-b-5)-y(a-b-5)
=(x-y)(a-b-5)

2. 2m2(4k-1)-3N(4k-1)-(1-4k)
=2m2(4k-1)-3N(4k-1)+(4k-1)
=(4k-1)(2m2-3N+1)

1)
=2mr-4m+kmr-2km
=2mr+kmr-4m-2km
=mr(2+k)-2m(2+k)
=(2+k)(mr-2m)

2008-08-26 13:38:35 補充：
2)
x(a-b)+y(b-a)
=x(a-b)-y(a-b)
=(a-b)(x-y)

3)
(b-c)*+(c-b)
=???

2008-08-26 13:39:54 補充：
4)
x(a-5)-(5y-ay)
=xa-5x-5y+ay
=a(x+y)-5(x+y)
=(x+y)(a-5)

2008-08-26 13:41:13 補充：
5)
5a(x-1)-10b(1-x)
=5a(x-1)+10b(x-1)
=(x-1)(5a+10b)
=5(x-1)(a+2b)

2008-08-26 13:44:02 補充：
6)
12a(m-n)+32a*b(n-m)
=12a(m-n)-32ab(m-n)
=(m-n)(12a-32ab)
=4a(m-n)(3-8b)

7)
a(x-y)+b(y-x)
=a(x-y)-b(x-y)
=(x-y)(a-b)