①3x²+6xy+3y²
=3(x²+2xy+y²)
=3(x+y)²
②81(m+n)²-16(m-n)²
=[9(m+n)]²-[4(m-n)]²
=(9m+9n+4m-4n)(9m+9n-4m+4n)
=(13m+5n)(5m+13n)
③4x²(x-y)+(y-x)
=4x²(x-y)-(x-y)
=(x-y)(4x²-1)
=(x-y)(2x+1)(2x-1)
④16x的四次方-8x²y²+y四次方
=(4x²-y²)²
=(2x+y)²(2x-y)²
⑤x²y的n-1次方-y的n+1次方
=y的(n-1)次方(x²-y²)
=y的(n-1)次方(x+y)(x-y)
⑥-4a²x²+8ax-4
=-4(a²x²-2ax+1)
=-4(ax-1)²
⑦x²-y²-2x+2y
=(x+y)(x-y)-2(x-y)
=(x-y)(x+y-2)
⑧4x²-y²-4x+1
=(4x²-4x+1)-y²
=(2x-1)²-y²
=(2x-1+y)(2x-1-y)
①3x²+6xy+3y²②81(m+n)²-16(m-n)²③4x²(x-y)+(y-x)
①3x²+6xy+3y²②81(m+n)²-16(m-n)²③4x²(x-y)+(y-x)
④16x的四次方-8x²y²+y四次方
⑤x²y的n-1次方-y的n+1次方
⑥-4a²x²+8ax-4
⑦x²-y²-2x+2y
⑧4x²-y²-4x+1
④16x的四次方-8x²y²+y四次方
⑤x²y的n-1次方-y的n+1次方
⑥-4a²x²+8ax-4
⑦x²-y²-2x+2y
⑧4x²-y²-4x+1
数学人气:925 ℃时间:2019-10-08 11:24:30
优质解答
我来回答
类似推荐
猜你喜欢
- 1they each bought a new bike(同义句)
- 2一根圆柱形木料长1.5米,体积是79599立方厘米,把它沿底面直径平均钜成两半后,表面积增加了
- 3已知函数f(x)=lnx+1−xax,其中a为大于零的常数. (1)若函数f(x)在区间[1,+∞)内单调递增,求a的取值范围; (2)求函数f(x)在区间[1,2]上的最小值.
- 4如图所示,用同种材料制成一个竖直平面内的轨道,AB段为1/4圆弧,半径为R,BC段水平且长度为R,一小物块质量为m与轨道间动摩擦因数为μ.当它从轨道顶端A无初速下滑时,恰好运动到C点
- 5写老师公布考试成绩时,“我”紧张的好词好句好段
- 6一段导线均匀拉长2倍,电阻增加多少?平均对折变成1段导线,电阻是原来的多少?
- 7i am writing this letter to thank you for teaching me english this summer
- 8写出下列动词的过去式:rain:put:die:think:fly:make:study:teach:have:swim:come:leave:
- 9一项工程,甲独做要10天,乙独做要15天,甲乙合做工作率下降80%,这项工程必须8天完成甲乙最少合作多少天
- 10描写思乡和爱国的诗歌,要有作者和名句!