在化简(x y)(x-2y)-my(nx-y-搜答案-智慧作业帮

x^2+2xy+y^2/x^2-y^2除以x^2+xy/xy-y^2=(x＋y)²／(x＋y)(x－y)÷x(x＋y)／y(x－y)=(x＋y)／(x－y)×y(x－y)／x(x＋y)=y／

(x-2)²+∣y-3∣=0(x-2)²=0,∣y-3∣=0x=2y=3(x-y)/(x²-2xy+y²)-(xy+y²)/(x²-y

x=2+m/3;y=2m/3-2∵xy小于0∴（6+m）×（2m-6）＜0-6＜m＜3又∵x、y都为整数∴m为3的整数倍,所以m为-3,0

3x²y-[2xy²-2(xy-3/2x²y)+xy]+3xy²=3x²y-2xy²+2xy-3x²y-xy+3xy²=

xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y}=xy-2[xy-(3x²y-xy²-0.5xy)+4x²y]=xy-2(x

(x+y)^2/xy-(x-y)^2/xy=【(x+y)^2-(x-y)^2】/xy=（x²+y²+2xy-x²-y²+2xy）/xy=4xy/xy=4很高兴为

化简求值：(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy)=(x-y)²-(x-y)²-3x²-1/2y=-3

解3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²=3x²y-(2xy-2xy+3x²y+xy)+3xy²=3x²y

2x^2y+[2xy-[3x^2y-2[2xy-3xy^2]]-4xy^2]=2x^2y+[2xy-[3x^2y-4xy+6xy^2]-4xy^2]=2x^2y+[2xy-3x^2y+4xy-6xy^

(xy-x²)÷(x²-2xy+y²)/(x-y)×(x-y)/x²=-x(x-y)÷(x-y)²/x²=-x(x-y)×x²/(

急不解决问题最后还是靠自己多动脑看课本其实都是课本上的再问：你看看啊！课本上没有，不会才问的！.........

M=(2x^2y+xy^2)（x-2y)-(2x^2-3xy+xy^2)(-xy)很简单啊.

(1)X+Y=M(2)2X-Y=6(1)+(2)3X=M+6X=(M+6)/3=M/3+2Y=2X-6=(2M-6)/3=2M/3-2XY是整数所以M是3的倍数XY

(x+y)(x-y)-(x-y)²-6x²y/2y+(2xy)²/(-4xy)=x²-y²-x²+2xy-y²-3x²-

原式=(x^2-y^2-x^2-2xy-y^2-2xy+2y^2-2xy)/xy=(-6xy)/xy=-6

-5y²+{2xy-[y²+x²-(1-y²)+2xy]+3x²｝=-5y²+{2xy-y²-x²+(1-y²

x>0;y>0积3>=(6xy)^0.5=>9>=6xy=>1.5>=xy=>max(xy)=1.5...ans此时2x=3y=3;x=1.5,y=1

相加得X=(M+6)/3,相减得Y=(2M-6)/3,XY=(2M^2+6M-36)/9

5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2=5xy^2-3xy^2+(4xy^2-2x^y)+x^2y-xy^2=5xy^2-3xy^2+4xy^2-2x^y+x^2y-

3(1,4)和0(2,2)