(-xy)的5次方÷(xy)的2次方
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x²-2xy+y²/x²-xy÷(xy的-1次方-x的-1次方y)=(x-y)²/x(x-y)÷(x/y-y/x)=(x-y)/x÷(x²-y
-xy(x的2次方y的5次方-xy的3次方-y)=-xy²(x²y的4次方-xy²-1)=-(xy²)[(xy²)²-(xy²)-
--3(2x的2次方--xy)+4(x的2次方+xy--6)=--6x^2+3xy+4x^2+4xy--24=--2x^2+7xy--24.
原式=xy(x+y)=3×5=15
(3X^2-5XY)+{-X^2-[-3XY+2(X^2-XY)+Y^2]}=3X^2-5XY-X^2+3XY-2X^2+2XY+Y^2=Y^2
由x²-2xy+y²=12x²-5xy-3y²=0得(x-y)²=1(x-3*y)*(2*x+y)=0所以x-y=1或者-1x=3y或者2x+y=0分
2x的3次方减去0.5xy的3次方-2/3xy的3次方-xy的3次方-0.25x的3次方y=2x³-0.5xy³-2/3xy³-xy³-0.25x³y
=(-xy)的(5-2)次方=(-xy)的3次方=-x³y³再问:4分之3a的平方b的三次方×(﹣9分之8abc),教我一下吧,明天要考试了再答:(3/4)(a²b
原式=3x²y+3xy-4xy+8x²y+xy=11x²y
原式=3x的2次方y/(-1/2xy)-xy的2次方/(-1/2xy)+1/2xy/(-1/2xy)=-6x+2y-1
三进制则最大数字是2所以是222x2+x=1x2+x+1/4=1+1/4(x+1/2)2=5/4x+1/2=±√5/2x=(-1-√5)/2,x=(-1+√5)/2
多项式xy的2次方-9xy+5x的2次方y-25的二次系数是(-9)-9xy是二次项所以二次系数是(-9)
∵(x+1)²+|y-1|=0∴x+1=0,y-1=0∴x=-1,y=1∴2(xy-5xy²)-(3xy²)-(3xy²-xy)=2xy-10xy²-
∵xy≥0,5x³﹥0∴x﹥0,y≥0原式=5√(xy)÷√(5x³)=5√(xy÷5x³)=5√(xy×1/5x³)=5√(y/5x²)=5√[5y
-5(xy-2x^2)+(5xy-x^2)-2(3x^2-5xy)=-5xy+10x^2+5xy-x^2-6x^2+10xy=(10x^2-x^2-6x^2)+(-5xy+5xy+10xy)=3x^2
答:x的2次方-(3xy+4y的2次方)-(11xy-5y2的次方)-3x的2次方=x²++y²-14xy=7-14*(-1)=7+14=21
-2x的平方-12xy的2次方+8xy的3次方=-2x(x+6y²-4y³)
xy+(-3x²y²)+(-5xy)+(-2x²y²)+4xy=xy-3x²y²-5xy-2x²y²+4xy=-5x
解x²+y²=7xy=-15x²-(3xy+4y²)-(11xy-2y²)-7x²=(5x²-7x²)+(-3xy-11