10a(x-y)²-5b﹙y-x﹚-搜答案-拍题作业网

1.（x+y）²=（-6）^2=36（y-x）²=(-5)^2=25xy=[(x+y)^2-(x-Y)^2]/4=(36-25)/4=2.75x²-y²=(x+

1：=（a-b)(x-y-x-y)=(a-b)(-2y)2:=4a^2+4ab+b^2+8ab=4a^2+12ab+b^23:=[(4x)^4+1][(2x)^2+1]][(2x)^2-1]4:=(x

15

3a+6b=3xx=a+2b14y-4=20y+3y+15-9y=19y=-19/9

(2x+y)(2x-3y)+x(2y+y)=(2y+y)(2x-3y+x)=(2y+y)(3x-3y)=3(2y+y)(x-y)2a(x-y)-4b(x-y)=2(x-y)(a-2b)

5a(x+y)-10b(y+x)=5(x+y)(a-2b)

A是函数y=-4x+6值域.B是函数y=5x-3的定义域.A=RB=RA∩B=R

y=a+b*a-b-a+b/a-b=5+2*5-5+2/5-2

p(x-y)-q(y-x)=p(x-y)+q(x-y)=(p+q)(x-y)(a+b)(a-b)-(b+a)=(a+b)(a-b-1)10a(x-y)^2-5b(y-x)=10a(x-y)^2+5b(

1.5(2ax-2ay+b)(x-y)2.(x-y)(a-x)(a-y)3.3(2a+b)(4a-6b-1)再问：可不可以有过程？再答：1。原式等于10a(x-y)(x-y)+5b(x-y)=5(2a

(a-b)^2-6(b-a)+9.=（a-b-3）²25(x-y)^2+10(y-x)+1=[5(x-y)]^2-10(x-y)+1=[5(x-y)-1]²=(5x-5y-1)&#

是D啦-（2a-3）=-2a+3=3-2a再问：是对的吗?再答：肯定是对的哦

(5)a(x+y)-b(x+y)-x-y

a(x+y)-b(x+y)-x-y=a(x+y)-b(x+y)-(x+y)=(a-b-1)(x+y)

19（a-b)^2-16(a+b)^2=-7a^2-50ab-7b^2=-(7a+b)(a+7b)23x^3-12x^2y+12xy^2=3x(x^2-4xy+4y^2)=3x(x-2y)^2325(

分解为ax+ay+bx+by-ax+ay-bx+by=ay+by+ay+by=2ay+2by=2y(a+b)

=5a（y-x）（2y-2x-1）

2x+y=103x-y=5所以x=3,y=4所以A交B={(x,y)|(3,4)}他就是两条直线的交点坐标

（a-b)(x-y)-(b-a)(x-y)=(a-b)(x-y)+(a-b)(x-y)=2(a-b)(x-y)（a-b)(x-y)-(b-a)(x+y）=(a-b)(x-y)+(a-b)(x+y)=(

(a-b)(x-y)+(b-a)(y-x)

2(a-b)(x-y)

(x+y)(a-2b)

原式=x(a-2b)+y(a-2b)=ax-2bx+ay-2by