1;a=2b+3 3;x-y=13a=3b+20 x=6y-72;x-y=4 4;5x-y=1104x+2y=-1 9y-x=110 5;3m+b=11 6;0.6x-0.4y=1.1-4m-b=11 0.2x-0.4y=2.37;4f+g=15 8; (1/2x)+3y=-63g-4f=-3 (1/2x）+y=2

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={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 集合A={(x,y)|x-2y=1}B={(x,y)|x+3y=6},则A∩B= A∪B=? 已知：A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B 【高一数学】已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,且a∈B,则a为__已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,且a∈B,则a为__ 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) 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 集合A={（x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0 (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 x(x^2y^2-xy)-y(x^2-x^3y)a^4-(1-a)(1+a)(1+a^2)4x^3y+4x^2y^3+xy^38(a-b)^2+12(a-b)a^2-2ab+b^2-c^2若3^x=a,3^y=b,求3^2x-y的值 2a-(3d-a)+2b；（a+b)-(-b+c)；3(x-2y)-2(3x-y)其中X=1Y=2/1 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 已知集合A={(X,Y)/(a的平方-1)X+(a-1)Y=15},B={(X,Y/Y=(5-3a)X-2a}.若A∩B=空集则a=? 若A,B两点关于Y轴对称,且A在双曲线Y=1/2X上,B点在直线Y=3+X上,设A坐标为(a,b),则a*a/b+b*b/a=? 已知非空集A={(x,y)|(a^2-1)x+(a-1)y=15},B={(x,y)|y=(5-3a)x-2a},若A交B=空集,求实属a的值 已知A=3x-2y,B=x-3y+1,求3(A+B)-2(A-B)结果用x、y表示 关于X、Y的方程组｛X+Y=A+1,X-Y=3A-3的解X>Y,那么（）A:A>1B:A