[(3X-2Y)(2Y 3X)-(3X-2Y)的平方-13xy] (-y)-搜答案-搜狗做题网

[23x−2x+y(x+y3x−x−y)]÷x−yx=[23x−2x+y•x+y3x+2x+y•(x+y)]•xx−y=(23x−23x+2)•xx−y=2xx−y故答案为2xx−y．

3y^2=12y3y^2-12y=03y(y-4)=0y1=0,y2=43x^2-5x=0x(3x-5)=0x1=0,x2=5/3（x+3)^2=2x(x+3)x^2+6x+9=2x^2+6xx^2=

(x-y)^2-(x-y)^3=(x-y)^2[1-(x-y)]=(x-y)^2(1-x+y)2.（x+y）^2-（x+y）^3=（x+y)^2[1-(x+y)]=(x+y)^2(1-x-y)3、（x

(x+y)(x+y)^2(-x-y)^3=－(x+y）^6

解方程组2x−5＝y，①3x−2y＝12，②时，把①代入②即可消去y，达到消元的目的；解方程组2x+3y＝133x−4y＝−6时，想法把y的系数化为相同，然后用减法化去，达到消元的目的．故答案是：代入

y的平方+4=6Y公式B平方-4乘A乘CA=1B=-6C=4《A为2次项系数.》即：36-16=20Y=《-B+-根号B平方-4乘A乘C》除以2A最后Y=3+2倍根号5和3—2倍根号5

X+Y分之X-Y等于3x=-2yX+Y分之2(x-y)减X+Y分之3X+Y=(-x-3y)/(x+y)=1

因为(x-y)/(x+y)=3,则(x＋y)/(x－y)＝1/3则5(x-y)(x+y)-(x+y)/2(x-y)＝5*3-1/(3*2)=15-1/6=89/6

计算:(-x-2y) * (3x-y)

(-x-2y)*(3x-y)=-3x^2-5xy+2y^2

(x-y)^5*(y-x)^3*(x-y)^2=-(x-y)^5*(x-y)^3*(x-y)^2=-（x-y）^(5+3+2)=-(x-y)^10

(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方=x²-2xy-3y²-x²+4y²-x²+2xy-y²=(x²-

=(x-y)[(3x+y)-(2x+3y)]*(x-y)=(x-y)*(x-y)(3x+y-2x-3y)=(x-y)(x-y)(x-2y)到底是化简,还是?=(x*x-2xy+y*y)(x-2y)=x

1.15-9y-9x＞-9/43.3(x-1)-x+1212x>32X＞8/3

解题思路：根据题意，由整式的运算的知识整理，分析可以求得解题过程：

解代数式得：-3x的平方y-2y的三次方因为1/2的平方=-1/2的平方,所以结果仍正确给分吧!嘿嘿!

[23x-2x+y（x+y3x-x-y）]÷x−yx=（23x-23x+2）×xx−y=2xx−y，∵5x+3y=0，∴y=-53x，∴原式=2xx+53x=34．

(x+y)^2-3(x+y)=(x+y)(x+y-3)

(2X-3y)-(5x-y)

(2X-3y)-(5x-y)=2x-3y-5x+y=2x-5x-3y+y=(2x-5x)+(-3y+y)=-3x-2y这样写总是全过程了吧

(x+3y-4)(2x-y)

原式等于2x^2-xy+6xy-3y^2-8x+4y=2x^2+5xy-3y^2-8x+4y

(x+y)^2-(x+y)^3 .

(x+y)^2-(x+y)^3=(1-x-y)(x+y)^2(x-y)^2-(x-y)^3==(1-x+y)(x-y)^2