1 2(x y)5次方 2(x y)2次方
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-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)-
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
-2x²-12xy²+8xy³=-2x(x+6y²-8y³)4(x+y)²-2(x+y)=2(x+y)(2x+2y-2)2(x-y)
=(-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
3xy-3xy-xy+2yx=-xy+2xy=xy
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-
y(x+2)/(x-2)(x+2)=y/(x-2)提取yx²-4=(x-2)(x+2)
-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
-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
(-2x2次方y)乘(-三分之二xy)乘(-8xy)=-32/3X^(2+1+1)Y^(1+1+1)=-32/3*X^4Y^3
原式=12xy+3x2-5xy-6xy-4x2,=xy-x2.
0.X^2+XY=3;(1)XY+Y^2=2;(2)2*(1)-3*(2)=2*X^2-XY-3*Y^2=2*3-3*2=0