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

6x^2+xy-2y^2+2x-8y-8 =(2x-y)(3x+2y)+2(x-4y)-8 =(2x-y-2)(3x+2y+4) (运用十字相乘法)

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

6x^2-7xy+2y^2+12x+2y^2-7y+6因式分解 是不是题目不对?两个2y^2

(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

(x-2y)^2 =x^2+4y^2-4xy 25=x^2+4y^2+8 x^2+4y^2=17 (x+2y)^2 =x^2+4xy+4y^2 =17-8 =9 后面一题请检查下

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)原式=(78)6÷(-78)5+1-4×12=-78+1-2=-178;(2)原式=9x3y2÷(-3xy)-6x2y÷(-3xy)+3xy÷(-3xy)=-3x2y+2x-1;(3)原式=x2-(2y-3)2=x2-4y2+12y-9;(4)原式=1+[(-0.25×(-4)]2012×(-4)+5002-(500-2)×(500+2)=1+(-4)+5002...

2(3x2-2xy+4y2)-3(2x2-xy+2y2),=6x2-4xy+8y2-(6x2-3xy+6y2),=6x2-4xy+8y2-6x2+3xy-6y2,=-xy+2y2;当x=2,y=-1时,原式=-2×(-1)+2×(-1)2=2+2=4.

1(-7x^2y)(2x^2y-3xy^3+xy) =-14x^4y²+21x³y^4-21x^3y² 2.(x^4y+6x^3y^2-x^2y^3)/(3x^2y) =1/3X²+2xy-1/3y² 3.(2m+n-p)(2m-n+p) =4m²-(n-p)² =4m²-n²+2np-p² (-5x+3/2)(-5x-1.5) ...

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