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麻烦各位了.数学题(1)12a³b²-9a²+3ab(2)121x²-144y&

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/11/08 11:13:49
麻烦各位了.数学题
(1)12a³b²-9a²+3ab
(2)121x²-144y²
(3)4(a-b)²-(x-y)²
(4)(x-2)²+10(x-2)+25
(5)(a²-2ab+b)²-4
(6)16x²-4y²
(7)m²(x-y)+n²(y-x)
(8)(x²+y²)²-4x²y²
(9)(x²+2x)²+2(x²+2x)+1
(10)(xy+1)(x+1)(-y+1)+xy
(11) 2x²+2x+2/1
(12)(a-b)(3a+b)²+(a+3b)²(b-a)4x²-9y²=31的正整数解
谢谢了,要过程= =
化简
这干什么的,化简?
(1)12a³b²-9a²+3ab =
(2)121x²-144y² =(11x+12y)(11x-12y)
(3)4(a-b)²-(x-y)²=(2a-2b+x-y)(2a-2b-x+y)
4)(x-2)²+10(x-2)+25 =(x-2+5)²=(x+3)²
(5)(a²-2ab+b)²-4=(a²-2ab+b+2)(a²-2ab+b-2)
(6)16x²-4y²=(4x+2y)(4x-2y)
(7)m²(x-y)+n²(y-x)=(x-y)(m²-n²)
(8)(x²+y²)²-4x²y²=( x²+y²+2xy)(x²+y²-2xy)=(x+y)²(x-y)²
(9)(x²+2x)²+2(x²+2x)+1= (x²+2x+1)²=(x+1)²
(10)(xy+1)(x+1)(-y+1)+xy =
(11) 2x²+2x+2/1 =2(x²+x+1/4)=2(x+1/2)²
(12)(a-b)(3a+b)²+(a+3b)²(b-a)4x²-9y²=31的正整数解