a) 5x-y=6 2x+y=1 b)3x-8y=2 2x+2y=-6

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 (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 集合A={(x,y)|x-2y=1}B={(x,y)|x+3y=6},则A∩B= A∪B=? （x+a）/2+（y-b)/3=a/2（x+a）/2-（y-b)=b/3（3x+2y）/4=（2x+y）/5=（x-y+1)/6 x+y-(2x-y)(x+y)=?12(a^2-b^2)^2-3(a^2+b^2)(a+b)^2等于多少(2a-b)(2a+3b)+3a(b-2a)=-(2a-b)( ),a(x-3)(5-x)+b(3-x)(x-5)=( )(x-3)(a+b)代数式15x^3y^3(x-y),6x^2y^2(y-x),-120x^3y^3（x-y）（x+y）的公因式是?a-b+k(b-a)=( )(k-1)a(b-c)+c-b=(b-c) 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 a) 5x-y=6 2x+y=1 b)3x-8y=2 2x+2y=-6 1.(a^2+ab+b^2)(a^2-ab+b^2)2.(7x-6y)^2+2(7x-6y)(7x+6y)+(7x+6y)^2化简求值1.(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy)其中x=1,y=-1/42.已知x=6.61,y=-3.39.求(x-y)(x^2+3xy+y^2)-5xy*(x-y)的值 己知A=6x+4y-5 B=2(x+y)+(x-3) (1)当x=y=-2吋,A-B的值 A={(x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0A={(x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0 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 集合A={（x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0 先化简 在求值1.（2x+3y)^2-(2x+y)(2x-y),其中x=三分之一,y=二分之一2.[（x-y)^2+(x-y)(x+y)]/x,其中x=-1,y=二分之一3.4x(y-x)+(2x+y)(2x-y),其中x=二分之一,y=-24.2(x+5)(x-4)-3(x-6)(x+1),其中x=25.(2a-b)(b+2a)+2b(a+b)-3a^2b/b,其 1（x-3x-1）（x+3y-1)2（3x-2y+1/4）²3（a+b)²-（a-b）²4 [2x²-（x+y)(x-y)][（-x-y)×（y-x)+2y²],其中x=1 y=25[（0.5x-y)²+（0.5x+y)²]（0.5x²-2y²）6（a+3b)²-2（a+3b)(a-3b)+(a-3b)²7 已知6x^2-7xy-3y^2+14x+y+a=(2x-3y+b)(3x+y+1),则a=?,b=? 数学题集合A={y丨y=x平方-2x+3} B={y丨y=-x平方+5x+6} 求A∩B A=｛（x,y）|2x-y=1｝,B=｛（x,y）|5x+y=6｝,求A∩B