(-2x^3y^4)^2·(-1/2xy^4z^4) 已知n为正整数 且(x^n)^2=8 求(1/2x^3n)^2-3(x^2)^2n
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(-2x^3y^4)^2·(-1/2xy^4z^4)已知n为正整数且(x^n)^2=8求(1/2x^3n)^2-3(x^2)^2n(-2x^3y^4)^2·(-1/2xy^4z^4)已知n为正整数且(
(-2x^3y^4)^2·(-1/2xy^4z^4) 已知n为正整数 且(x^n)^2=8 求(1/2x^3n)^2-3(x^2)^2n
(-2x^3y^4)^2·(-1/2xy^4z^4)
已知n为正整数 且(x^n)^2=8 求(1/2x^3n)^2-3(x^2)^2n
(-2x^3y^4)^2·(-1/2xy^4z^4) 已知n为正整数 且(x^n)^2=8 求(1/2x^3n)^2-3(x^2)^2n
=5+63+69+965+5
=95623
XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)
已知1/x-1/y=2,求3x+7xy-3y/2x-3xy-2y答案是1/x-1/y=2(y-x)/xy=2 得:x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/7 谁能帮我解释一下=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy) 是怎
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
(-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1
x-y=1,xy=2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
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若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
(x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1)
化简:3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6
x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)²
xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
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计算3xy[2xy-x(y-2)+x-1]
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(-3x^y+2xy)-( )=4x^+xy
[(2xy^3)^2÷(3x)]·[8xy÷(4xy)],其中x=1000,y=-1