xy=3,s y=负5
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x=-1/5y=-1/35x²y-2xy²-3xy-2xy-5x²y+2xy²=-5xy=-5(-1/5)(-1/3)=-1/3
原式=(1-2)+(3-4)+(5-6)……(99-100)=-1-1-1-1-1-1-1……-1=-1*(100/2)=-1*50=-50哈哈相信我把
负一再问:再问:是对的吗?再答:不对的再问:那里错了?再答:后面错了再答:先乘XY再答:结果为负一再问:哦
x+y=5xy=-3(2x-3y-2xy)-(x-4y+xy)=2x-3y-2xy-x+4y-xy=x+y-3xy=5-3×(-3)=5+9=14
x+(xy-4x)-3y=x-4x-3y+xy=-3(x+y)+xy=1-3=-2
-3k+9=0k=3
=3x平方y-2x平方y+6xy-3x平方y+xy=-2x平方y+7xy=-2*1*(-2)+7*(-1)*(-2)=4+14=18
因为〔〕-〔X^2+3XY〕=-XY-1/3Y^2,求被减数为多少,被减数=X^2+3XY+(-XY-1/3Y^2)=X^2+3XY-XY-1/3Y^2=X^2+2XY-1/3Y^2
(2x-3y-2xy)-(x-4y+xy)=2x-3y-2xy-x+4y-xy=(2-1)x+(-3+4)y+(-2-1)xy=x+y-3xy因为x+y=5,xy=-3所以原式=5+9=14
(1)×7+(2)×328y+27y=55xy所以y=0或x=1分别代入所以x=0.y=0x=1,y=1/2
x²+xy=3………………………①y²+xy=-2……………………②①+②得:x²+2xy+y²=1(x+y)²=1x+y=±1∴x²+3x
由A=5x*2y-3xy*2+4xy,B=7xy*2-2xy+x*2y得,A+B=6x*2y+4xy*2+2xy则,所求的式子可转化为-0.5x(6x*2y+4xy*2+2xy)-5x*2y-3xy*
x²-xy=5xy-y²=-3x²-y²=2原式=x²-y²=2x²-2xy+y²=x²-xy-(xy-y
x+y=3xyx^4+y^4+2(xy)^2=9(xy)^2x^4+y^4=7x^2y^2xy的负二次方+x的负二次方y=x^2/y^2+y^2/x^2=x^4+y^4/x^2y^2=7
解题思路:此题考查对数函数的运算及性质,第二问较难,考查复合函数的单调性与值域,需要分类讨论解题过程:
4xy-(2x²+5xy-y²)+2(x²+3xy)=4xy-2x²-5xy+y²+2x²+6xy=5xy+y²x=-2,y=1/
已知X,Y互为负倒数则xy=-1(a-5)*(a-5)+|b+5|-{(xy)*(xy)*(xy)}/5=(a-5)²+Ib+5I-(-1)/5=1/5即(a-5)²+Ib+5I=
=xy(1-2y^2)=-0.119616
1、x²+xy=5xy+y²=-4相减x²-y²=92、相加x²+2xy+y²=(x+y)²=1x²-y²=(
(-2xy²/3x³y)的负3次方=(-2y²/3x²)的负3次方=(-3x²/2y²)³=-27x的6次方/8y的6次方