請教我怎樣計

2012-10-14 6:18 am
Factorize:

2 2
p - (p+q) =?


2 2
9p - q - 12p - 4q =?


2 2
m (x+y) - 4m(x-y) = ?


2 42
x y - 16x = ?


2 2
18a + 15b - 50b - 9a = ?




















回答 (1)

2012-10-14 8:50 am
✔ 最佳答案
1. p-(p+q)
=p-p-q
=-q

2. 9p-q-12p-4q
=-3p-5q

3. m(x+y)-4m(x-y)
=m(x+y-4x+4y)
=m(5y-3x)

4. xy-16x
=x(y-16)

5. 18a+15b-50b-9a
=9a+35b


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