多項式乘法

2006-10-20 2:36 am
由於生病好一段時間,數學己經講到多項式乘法,只看課本大概都明白,但功課上始終有四五條不太明白,可以列式並把答案列出作解答嗎?
(4a2+2ab+b2)+(-2a-b)
(4x2-x+3)(x+1)
(x+1)2

回答 (5)

2006-10-20 2:42 am
✔ 最佳答案
(4a²+2ab+b²)+(-2a-b)
=4a²+2ab+b²-2a-b
=4a²-2a+2ab-b+b²

(4x²-x+3)(x+1)
=(4x²-x+3)x+(4x²-x+3)(1)
=4x³-x²+3x+4x²-x+3
=4x³+3x²+2x+3

(x+1)²
=(x+1)(x+1)
=(x+1)x+(x+1)(1)
=x²+x+x+1
=x²+2x+1
參考: Calculation
2006-10-20 3:06 am
(1)
(4a^2+2ab+b^2)+(-2a-b)
=(2a+b)^2-(2a+b)
(2)
(4x^2-x+3)(x+1)
=x(4x^2-x+3)+1(4x^2-x+3)
=4x^3-x^2+3x+4x^2-x+3
=4x^3+3x^2+2x+3
(3)
(x+1)2
=2x+2
2006-10-20 2:49 am
(x+1)2
=(x)2+2(x)(1)+(1)2
=x2+2x+1
2006-10-20 2:47 am
1) (4a2+2ab+b2)(-2a-b)
= 4a2(-2a-b)+2ab(-2a-b)+b2(-2a-b)
= -8a3- 4a2b- 4a2b -2ab2 -2ab2-b3
= -8a3 -8a2b -4ab2-b3
2) (4x2-x+3)(x+1)
= 4x2(x+1) -x(x+1) +3(x+1)
= 4x3 +4x2 -x2 -x + 3x + 3
= 4x3 +3x2 + 2x + 3
3) (x+1)2
= (x+1)(x+1)
= x(x+1)+1(x+1)
= x 2+ 2x + 1



2006-10-20 2:43 am
這些問題是答案了,不可以列式並把答案列出作解答!

(4a2+2ab+b2)+(-2a-b)

(4x2-x+3)(x+1)

(x+1)2


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