a的三次方-4ab²(x-y)² 4xy
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A-B=x³+2y³-xy²-(-y³+x³+2xy²)=x³+2y³-xy²+y³-x³
X³+Y³=(X+Y)(X²-XY+Y²)
a平方+5ab+4b平方=(a+4b)(a+b):-10x的三次方y的二次方z的三次方-35xy三次方z+15x二次方yz=-10x³y²z³-35xy³+15
27x的3次方+54x平方y+36xy平方+8y的三次方=(3x)^3+3*(3x)^2*(2y)+3*(3x)*(2y)^2+(2y)^3=(3x+2y)^3a平方+b平方+4a-4b-2ab+4=
(x+y)三次方×(2x+2y)三次方×(3x+3y)三次方=(x+y)³×8(x+y)³×27(x+y)³=216((x+y)的9次方
解1题原式=-6a²b(x-y)³×[(-1/3)ab²(y-x)²]=-6×(-1/3)×a²×a×b×b²×(x-y)³×(y
您好:【(5x+3y)²+(x+3y)(x-3y)】/4x=(25x²+30xy+9y²+x²-9y²)/4x=(26x²+30xy)/4x
x²y³-2x(4xy³)=x²y³-2x²y³=-x²y³
=xy(4x²+4xy+y²)=xy(2x+y)²
4x的三次方y+4x²y²+xy的三次方=xy(4x²+4xy+y²)=xy(2x+y)²
解(1)30a的系数是30,次数是1(就是a的指数)解(2)-x³的系数是-1,次数是3解(3)y的系数是1,次数是1(就是y的指数)解(4)ab²c³的系数是1,次数是
x³y-xy³=xy(x²-y²)=xy(x+y)(x-y)
xy(x+y)²-4x³y³=xy[(x+y)²-4x²y²]=xy(x+y+2xy)(x+y-2xy)
(1)a的三次方b-2a²b²+ab的三次方=ab(a的平方-2ab+1)(2)9x²-y²-4y-4=(3x)²-(y+2)²=(3x+y
a的三次方乘(x+y)的平方减4a的三次方c的平方=a^3[(x+y)^2-4c^2]=a^3(x+y+2c)(x+y-2c)
解x²-x-4y²+2y=(x²-4y²)-(x-2y)=(x-2y)(x+2y)-(x-2y)=(x-2y)(x+2y-1)4a²b-3ab
2A-3B=2(3x³y-4y³)-3(-x²y²+2y³)=6x³y-8y³+3x²y²-6y³=
x+y=1,xy=3有问题,已不在实数范围内二分之一a²-0.5ab=a/2*[a-b]2009²-2008*2010=2009²-[2009-1]*[2009+1]=2
您好:x的三次方(y-x)的三次方-(x-y)的三次方=x的三次方(y-x)的三次方+(y-x)的三次方=(x³+1)(y-x)³=(x+1)(x²-x+1)(y-x)&