A={y|y=x^2-2x+3},B={y|y=2x^2-3x+2} 则A和B的交集等于?
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x+y=a,x-y=b.求2x-3y等于
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
已知3x+2y=a,2x+3y=b,则(x+y)(x-y)=?
集合A={(x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0
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若集合A={(x,y)|y>=|x-2|} ,B={(x,y)|y
A={(x,y)|y>=0.5|x-2|},B={(x,y)|y
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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
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