关于初二数学题1.(x+y)^3-(x-y)^2(x+y)2.已知a+b=1,求证a^3+b^3+3ab=1
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
已知集合A={(x,y)| (y-3)/ (x-1)=2,x,y∈R},B={(x,y)| 4x+ay=16,x,y∈
初二数学题若a方+b方-2a+4b+5=0,则 b的a次方 = 已知2x-y=-1/3,x+y=15,则多项式2x平方+
已知集合A={(x,y)|(y-3)/(x-2)=a+1}B={(x,y)|(a^2-1)x+(a-1)y=15},当a
已知:6x²-7xy-3y²+14x+y+a=(2x-3y+b)(3x+y+1)求a,b的值
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
已知:a+b=3,x-y=1,求a2+2ab+b2-x+y的值.
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
高二数学题难死了集合A={(x,y)丨y=-x^2+mx-1},B={(x,y)丨y=3-x,0
已知3x+2y=a,2x+3y=b,则(x+y)(x-y)=?
已知集合A={y|y=3x-1},集合B={y|y=x2-2x-3},AB交集是,