3xy^2÷(-6y^2/x)^3×(12y/x)^2
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3xy^2÷(-6y^2/x)^3×(12y/x)^2
3xy^2÷(-6y^2/x)^3×(12y/x)^2
3xy^2÷(-6y^2/x)^3×(12y/x)^2
原式=3xy^2×(-x^3/216y^6)×(144y^2/x^2)
=-x^4/72y^4×(144y^2/x^2)
=-2x^2/y^2
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化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+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
(-1/2xy)(2/3x^2y-3/2xy^2+6/5y)
几道数学题:x-x^2分之x^2-1×1-y分之xy-x,(xy-x^2)÷xy分之x-y,x^2+x分之x-3÷(x^2-6x+9)谢谢!
x^2-xy-6y^2+3xy+y+2
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x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)²
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xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
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