3^x=a ,3^y=b ,求3^(2X=Y+1)和3^(2X=Y-1)的值

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 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)|x=2},B={(x,y)|y=3},求A∩B和AUB 设集合A=｛y/y=x²-2x+3,x∈R｝,B=｛y/y=-x²+2x+10,x∈R｝,求A∩B设集合A=｛（x,y)/y=x+1,x∈R｝,B=｛（x,y)/y=-x²+2x+3/4,x∈R｝,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) 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 ab是有理数a*b=2a-3b求【（x-y)*（x+y)】*x的值 单项式A,B满足等式2x(A-3x)=4x的平方y+B,求A,B 已知集合A={(x,y)|2x-3y=1},B={(x,y)|3x+2y=1}求A交B 已知：集合A=｛（x,y）|3x-2y=11｝,B=｛（x,y）|2x+3y=16｝,求A∩B 已知：集合A={(x,y)│3x-2y=11},B={(x,y)│2x+3y=16}求A∩B 设A=｛（x,y）|3x-2y=11｝,B=｛（x,y）|2x+3y=16｝,求A交集B 设A={（x,y)|3x-2y=11},B={(x,y)|2x+3y=16},求A交B A={(x,y)|3x+y=7} B={(x,y)}2x-y=3}求 A交B 设集合A={(x,y)|3x+2y=5},B={(x,y)|4x-y=3},求A∩B 设集合A={(x,y)|3x+y=5},B={(x,y)|2x-3y=-4},求A交B