急!!因式分解(F.2MATH)10分

🎓 學業台教學

Wing Yan

2007-12-09 9:07 pm

1.501^2

2.2(x-y)^2+8(x-y)+8

回答 (2)

kelvin

2007-12-11 3:36 am

✔ 最佳答案

1)501^2
=(500+1)^2
=500^2+2(500)(1)+1^2
=250000+1000+1
=251001

2)2(x-y)^2+8(x-y)+8
=2[(x-y)^2+4(x-y)+4]
=2(x-y+2)(x-y+2)
=2(x-y+2)^2

參考: me

👍 0 👎 0

ao ao

2007-12-10 8:08 pm

1. (500 + 1)^2
= 500^2+2(500x1)+1^2
=250000+1000+1
=251001

2. 2(x-y)^2+8(x-y)+8
= 2(x^2-y^2)+8x-8y+8
= 2x^2-2y^2+8x-8y+8
= 2[x^2-y^2+4x-4y+4]

👍 0 👎 0