✔ 最佳答案
m.x(2a+2b)+y(ac+bc)
=2x(a+b)+cy(a+b)
=(2x+cy)(a+b)
n.5(3m-n)-a(9m-3n)
=5(3m-n)-3a(3m-n)
=(5-3a)(3m-n)
o.x(ab-ac)+y(ac-ab)
=ax(b-c)-ay(b-c)
=(ax-ay)(b-c)
p.x(2a+2b)-y(7a+7b)
=2x(a+b)-7y(a+b)
=(2x-7y)(a+b)
q.(x+y)2次-(x+y)a
=(x+y)(x+y)-a(x+y)
=(x+y-a)(x+y)
r.c(x-y)2次-b(x-y)2次
=c(x-y)(x-y)-b(x-y)(x-y)
=(cx-cy)(x-y)-(bx-by)(x-y)
=(cx-cy-bx+by)(x-y)
s.m(2x-1)-n(1-2x)
=m(2x-1)+n(2x-1)
=(m+n)(2x-1)
t.(x+y)(a-b)+(x+y)(a+b)
=(a+b+a-b)(x+y)
=(2a)(x+y)
u.(m-n)2次+n(n-m)
=(m-n)(m-n)-n(m-n)
=(m-n-n)(m-n)
=(m-2n)(m-n)
v.(m+n)2次+2m+2n
=(m+n)(m+n)+2(m+n)
=(m+n+2)(m+n)
w.(a+b)2次-ax-bx
=(a+b)(a+b)-x(a+b)
=(a+b-x)(a+b)
x.(2m+n)2次-4m-2n
=(2m+n)(2m+n)-2(2m+n)
=(2m+n-2)(2m+n)
y.(4a+b)2次+(4a+b)(2a-b)
=(4a+b)(4a+b)+(4a+b)(2a-b)
=(4a+b+2a-b)(4a+b)
=(6a)(4a+b)
z.拍謝 我愛你的答案
2013-08-28 17:46:03 補充:
哈哈~
大家唔洗爭^^
2013-08-28 20:03:41 補充:
感謝分享!
很有用.