A=(2x-y)B=(-2x-y),求A*B

已知x+y=a,x-y=b.求:x^2+y^2;xy x+y=a,x-y=b.求2x-3y等于 已知：A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B A:{(x,y)|y=x方+2x},B:{(x,y)|y=x+a},A交B的真子集为空集,求a的范围 A=(x-y)*100;B=(x+y)/2;x=?/y=?/求X及Y解答公式 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 A={(x,y)|y=x^2,x∈R},B={(x,y)|y=x,x∈R},求A∩B A=(2x-y)B=(-2x-y),求A*B 已知A=(2x-y)B=(-2x-y),求A*B （x-A）*(B-y)=x^2-9xy+8y^2,求A,B 几道比例线段题目已知两实数a,b满足a^2-4ab+4b^=0,求(a+b)/a已知x/2=y/3,求(x-y)/y ,(x+y)/y ,(x+y)/(x-y) A={(x,y)|x=2},B={(x,y)|y=3},求A∩B和AUB 若A｛（X,Y)｜Y=x2-2｝,B｛（X,Y)｜X=Y2-2｝,求A∩B 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 已知集合A={x+y|y=x^2,x属于R},B={y|y=1-|x|,x属于B},求A∩B. 1、(-y^3)^5/y^3/ y^2+2(-y)^102、(x-y)^7/(y-x)^6+(x+y)^3/(x+y)^23、已知X^a=5,x^b=3,求X^(3a-2b)的值 几道 数学题急啊 对了再加20分(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3 (x-y)^2-(y-x)^32(x-y)-3(y-x)^24ab(a+b)^2-6a^2b(a+b)(x+y)(x-y)-(x+y)^28a(x-y)^2-4b(y-x)a=-5 a+b+c=-5.2求代数式a^2(-b-c)-3.2a(c+b)的值 设集合A={(x,y)|2x+y=1,x,y属于R},B={(x,y)|a^2x+2y=a,x,y属于R},若A∩B=空集,求a的值