5x+3y=4a.6x-2y=9a.4x-5y=8a-3.求a值,并解方程组.最好有过程.

(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 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 如果A={（x,y）|x,y+2>0},B={（x,y）|2x+3y-6>0},C={（x,y）|x-4 (x-2y)^5=a0(x+2y)^5+a1(x+2y)^4*y+a2(x+2y)^3*y^2+a3(x+2y)^2*y^3+a4(x+2y)y^4+a (1)x^2*x^8+x^13/x^3 (2)a^19/a^12/a^3 (3) (x-2y)^5/(2y-x)^3 (4)(x-y)^5/(x-y) (5)(x-y)^6/(y-x)^4 1题（m-n-3）² = 2题（a²+9)²-(a+3)(a-3)(a²+9)= 3题(a-2)[(a-2)²+6a]+(a+3)[(a+3)²-9a]= 4题 (x+y)²-4(x+y)(x-y)+4(x-y)²= 5题 先化简再求值[(x-y)²=(x+y)(x-y)]÷2x 其中x=3 y=-1.5 xy²/(x²y) - y×x²/(x²+x)=(x²-3x)/(x²-5x×2x) - 10/(x²-6x+9)=2a/(a²-4) - 1/(a-2)=2/(1-a ) - 1/(a-1)=x²-1/(x²-x-2)除以x/2x-4,其中x=1/2[x-x/(x+1)]除以[x/(2x-4)] ,其中x=√2+1 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 a^x=2,a^y=5,则a^4x-3y=? 集合A={y/y=1-x-4/x},B={X/X^2-(3+a)X+3a 集合A={y|y=1-x-(4/x)},B={x|x^2-(3+a)x+3a 设A={(x,y)}|3x+2y|.设A={(x,y)}|3x+2y|.B={(x,y)|x-y=2|},C={(x,y)|2x-2y|=3},D={(x,y)|6x+4y=2|},求A∩B,B∩C,A∩D设A={(x,y)|3x+2y=1}.B={(x,y)|x-y=2},C={(x,y)|2x-2y=3},D={(x,y)|6x+4y=2},求A∩B，B∩C，A∩D 已知x/3=y/4=z/6 ,求代数式2x-y+5z/x+3y-z的值已知x+y/x-y等于3,求x+y/x-y-3（x-y）/5（x+y）的值若b/a=3,则代数式3a-b/a的值为 几道初一的整式运算题目,会做的来~1.(a-b)^m(a-b)[2(b-a)]^3[(b-a)^5]^2/(a-b)^m2.(2006^2+2004^2+```+2^2)-(2005^2+2003^2+```+1)3.先化简,后求值.(1)x(x+4)(x-4)-(x+3)(x^2-6x+9)+5x^3y^2/(x^2y^2),其中x=-3.(2)y(x+y)+(x+y)(x-y)-x^2,其中x 关于分式的几道题(1)a^2/a^2+2aX(a^2/a-2-4/a-2)(1+x^2-1/x^2-2x+1)÷1/x-1x-y/x+3y÷x^2-y^2/x^2+6xy+9y^2-2y/x+y1/x-3=2+x/3-x A=｛y|y=-4x+6｝,B=｛x|y=5x-3｝,求A∩B. 如果(2x^2)y*A=(6x^2)(y^2)-(4x^3)(y^3),求多项式A 5x-3y=-4ax+5y=a+2x+y=0