a+2a= 8b-b= y+9y= x+7x-4x=

（x-A）*(B-y)=x^2-9xy+8y^2,求A,B (1)(x+y)^2-(x+y)^3(2)(x-y)-(x-y)^3(3)(x-y)^2-(y-x)^3(4)2(x-y)-3(y-x)^2(5)4ab(a=b)^2-6a^2b(a+b)(6)(x+y)^2(x-y)+(x+y)(x-y)^2(7)2a(a-3)^2-6a^2(3-a)+8a(a-3)(8)24xy^2z^2(x+y-z)-32xyz(z-x-y)^2+8xy(z-x-y)(9)(a-b)(b-a)^n(b-a)^2n-1 [两解）（10）2^2=3,2^b a+2a= 8b-b= y+9y= x+7x-4x= 已知a,b,X,Y属于R+,求证a^2/X+b^2/Y>=(a+b)^2/(X+Y) 已知：A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B 已知实数a,b,x,y,满足不等式（a+b）(x+y)>2(ay+bx),求证（x-y）/(a-b)+(a-b)/(x-y)>=2 若集合A={(x,y)|y>=|x-2|} ,B={(x,y)|y A={（x,y)|y>=0.5|x-2|},B={(x,y)|y 填空：(b-a)(2x-y+1)=(a-b)( ) 设集合A={(x,y)|y≥|x-2|,x≥0}B={(x,y)|y≤-x+b}.若(x,y)∈A∩B,且x+2y的最大值为9,求b的值. 初一因式分解练习题,谁好心帮我解下表示平方1.2X~-3XY-X2.(X+Y)~(X+Y)(X-Y)(X+Y)(Y+Z)3.3X(a+2b)~-6XY(a+2b)4.a(x-y)-b(X-Y)-C(Y-X)5.(b-a)~-2a+2b6.(x-y)~-m(y-x)+y-x7.x(x-y)(a-b)-y(y-x)(b-a)8.已知a+b=13,ab=40,求 b+ab~的值 y=a^x*b^x求导 X=a*b*c,Y=a*b*c,[X,Y]=( ),(x.y)=( ). 集合A={y|y=x²-2ax+3b},B={y|y=-x²-2ax+7b},且A交B={y|2|≤y≤8}求a,b a(x-y)+b(x-y)=(x-y)(a-b),套用了什么公式? 抛物线y=2-(x-a)(x-b)(a y=(x/a)^b+(b/x)^a+(b/a)^x（a>0,b>0). 求导 (a-b)x+(a+b)y=2(a²-b²) (a+b)x+(a-b)y=2(a²+b²) 解方程组