knrt.net
当前位置:首页 >> 6x 2 xy 2y 2 2x 8y 8 >>

6x 2 xy 2y 2 2x 8y 8

原式=(2x-y)(3x+2y)+2x-8y-8 2x-y -2 × 3x+2y 4 x系数-6+8=2 y系数-4-4=-8、 原式=(2x-y-2)(3x+2y+4)

原式=3x(2x-y-2)+3xy+6x+xy-2y2+2x-8y-8=3x(2x-y-2)+4xy-2y2+8x-8y-8=3x(2x-y-2)+2y(2x-y-2)+2y2+4y-2y2+8x-8y-8=3x(2x-y-2)+2y(2x-y-2)+8x-4y-8=3x(2x-y-2)+2y(2x-y-2)+4(2x-y-2)=(2x-y-2)(3x+2y+4)

1. 6x^2+xy-2y^2+2x-8y-8 =(2x-y)(3x+2y)+2(x-4y)-8 =(2x-y-2)(3x+2y+4) 2. x^3-3x^2-13x+15 =x^3-3x^2+2x-15x+15 =x(x^2-3x+2)-15(x-1) =x(x-2)(x-1)-15(x-1) =(x-1)[x(x-2)-15] =(x-1)[x^2-2x-15] =(x-1)(x-5)(x+3) 3. (y+2-1)^4+(y+2+1)^4-27...

6x²+xy-2y²+2x-8y-8=0 (3x+2y)(2x-y)+2x-8y-8=0 (3x+2y+4)(2x-y-2)=0 3x+2y+4=0 2x-y-2=0 解得:x=0 y=-2

3x^2+6x+3 =3(x^2+2x+1) =3(x+1)^2 x^3y-2x^2y^2+xy^3 =xy(x^2-2xy+y^2) =xy(x-y)^2 不懂可追问,有帮助请采纳,谢谢!

若“log2(xy+4x-2y)=3”成立,则有xy+4x-2y=8则有x=2或y=-4若“x 2 +y 2 -6x+8y+25=0”成立,则有x=3且y=-4所以若“log2(xy+4x-2y)=3”成立,推不出“x 2 +y 2 -6x+8y+25=0”成立反之,若“x 2 +y 2 -6x+8y+25=0”成立,能推出“log2(xy+4x-2y)=3”成...

A.?6x2y3÷12x2y2=-12y,正确;B.左边=94x2y8?2x2y2=?98y6,不正确;C.左边=-6x2y5,因此不正确;D.左边=16x8y4x4y4=16x4,不正确.故选:A.

A-[B-(2B+A)] =A-B+2B+A =2A+B A=3x的平方-xy+y的平方,B=2x的平方-3xy-2y的平方 =6x²-2xy+2y²+2x²-3xy-2y² =8x²-5xy x=负2分之一,y=1。 =8*(-1/2)²-5*(-1/2)*1 =2+5/2 =9/2 =4.5 一楼上错的好搞笑。

(1) -3+(-x^2+4x)-(-8+3x^2) =-3-x2+4x+8-3x2 =5+4x-4x2(2)-1/2(4xy-8x^2 y^2)+1/3(xy-6x^2 y^2) =-2xy+4x2y2+xy/3-2x2y2 =-5xy/3+2x2y2

原式=(x³-6x²y+12xy²)+(-8y³+1)

网站首页 | 网站地图
All rights reserved Powered by www.knrt.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com