求几道因式分解题答案、要过程~!!!!!
1(a²+1)²-4a²22a(a-b)+4a(2a+3b)34m²+2mn+1/4n²43x-12x³59(...
1 (a²+1)²-4a²
2 2a(a-b)+4a(2a+3b)
3 4m²+2mn+1/4n²
4 3x-12x³
5 9(a+b)²-4(a-b)²
6 (x+y)²-4(x+y-1)
7 2yz-y²-z²+x²
8 a²(x-y)-4b²(x-y)
共8题 速度求过程 展开
2 2a(a-b)+4a(2a+3b)
3 4m²+2mn+1/4n²
4 3x-12x³
5 9(a+b)²-4(a-b)²
6 (x+y)²-4(x+y-1)
7 2yz-y²-z²+x²
8 a²(x-y)-4b²(x-y)
共8题 速度求过程 展开
2个回答
展开全部
1 (a²+1)²-4a²
=(a²+2a+1)(a²-2a+1)
=(a+1)²(a-1)²
2 2a(a-b)+4a(2a+3b)
=2a(a-b+4a+6b)
=2a(5a+5b)
=10a(a+b)
3 4m²+2mn+1/4n²
=(2m+n/2)²
4 3x-12x³
=3x(1-4x²)
=3x(1+2x)(1-2x)
5 9(a+b)²-4(a-b)²
=[3(a+b)+2(a-b)][3(a+b)-2(a-b)]
=(5a+b)(a+5b)
6 (x+y)²-4(x+y-1)
=(x+y)²-4(x+y)+4
=(x+y-2)²
7 2yz-y²-z²+x²
=x²-(y²-2yz+z²)
=x²-(y-z)²
=(x+y-z)(x-y+z)
8 a²(x-y)-4b²(x-y)
=(x-y)(a²-4b²)
=(x-y)(a+2b)(a-2b)
=(a²+2a+1)(a²-2a+1)
=(a+1)²(a-1)²
2 2a(a-b)+4a(2a+3b)
=2a(a-b+4a+6b)
=2a(5a+5b)
=10a(a+b)
3 4m²+2mn+1/4n²
=(2m+n/2)²
4 3x-12x³
=3x(1-4x²)
=3x(1+2x)(1-2x)
5 9(a+b)²-4(a-b)²
=[3(a+b)+2(a-b)][3(a+b)-2(a-b)]
=(5a+b)(a+5b)
6 (x+y)²-4(x+y-1)
=(x+y)²-4(x+y)+4
=(x+y-2)²
7 2yz-y²-z²+x²
=x²-(y²-2yz+z²)
=x²-(y-z)²
=(x+y-z)(x-y+z)
8 a²(x-y)-4b²(x-y)
=(x-y)(a²-4b²)
=(x-y)(a+2b)(a-2b)
更多追问追答
追问
能不能再问几道题、我可以+分的
1 若(x²+y²)(x²+y²-1)=12,则x²+y²=
2 利用因式分解计算
(1)1.99²+1.99*0.01 (2)124²*25-25*76²
3 a^4-4a³b+4a²b²,其中a=8,b=-2 求值
麻烦了!!~~~ 谢谢
追答
请采纳后求助,一定帮你做
展开全部
1、(a²+1)²-4a²=(a²+2a+1)(a²-2a+1)=(a+1)²(a-1)²
2、2a(a-b)+4a(2a+3b)=2a²-2ab+8a²+12ab=10a²+10ab=10a(a+b)
3、4m²+2mn+1/4n²=1/4(16m²+8mn+n²)=1/4(4m+n)²
4、3x-12x³=3x(1-4x²)=3x(1+2x)(1-2x)
5、9(a+b)²-4(a-b)²
=【3(a+b)+2(a-b)】【3(a+b)-2(a-b)】
=(3a+3b+2a-2b)(3a+3b-2a+2b)
=(5a+b)(a+5b)
6、(x+y)²-4(x+y-1)
=(x+y)²-4(x+y)+4
=(x+y-2)²
7、2yz-y²-z²+x²
=x²-(y²-2yz+z²)
=x²-(y-z)²
=(x+y-z)(x-y+z)
8、a²(x-y)-4b²(x-y)
=(x-y)(a²-4b²)
=(x-y)(a+2b)(a-2b)
2、2a(a-b)+4a(2a+3b)=2a²-2ab+8a²+12ab=10a²+10ab=10a(a+b)
3、4m²+2mn+1/4n²=1/4(16m²+8mn+n²)=1/4(4m+n)²
4、3x-12x³=3x(1-4x²)=3x(1+2x)(1-2x)
5、9(a+b)²-4(a-b)²
=【3(a+b)+2(a-b)】【3(a+b)-2(a-b)】
=(3a+3b+2a-2b)(3a+3b-2a+2b)
=(5a+b)(a+5b)
6、(x+y)²-4(x+y-1)
=(x+y)²-4(x+y)+4
=(x+y-2)²
7、2yz-y²-z²+x²
=x²-(y²-2yz+z²)
=x²-(y-z)²
=(x+y-z)(x-y+z)
8、a²(x-y)-4b²(x-y)
=(x-y)(a²-4b²)
=(x-y)(a+2b)(a-2b)
追问
能不能再问几道题、我可以+分的
1 若(x²+y²)(x²+y²-1)=12,则x²+y²=
2 利用因式分解计算
(1)1.99²+1.99*0.01 (2)124²*25-25*76²
3 a^4-4a³b+4a²b²,其中a=8,b=-2 求值
麻烦了!!~~~ 谢谢
追答
采纳后再提问,谢谢
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