(x y)的平方乘以(2x-3)-(2x-3)y的平方-搜答案-智慧作业帮

当x>y时答案是2分之5当xy时x-y=2y当x

已知多项式负五分之一乘以x的平方乘以y的m＋1次方＋xy的平方-3x的3次方-6是六次四项式,单项式2x的n次方乘以y的5-m次方的次数与这个多项式的次数相同,求m、n.满足2+m+1=6m=3n+5

由x-3y=0可知x=3y原式=(2x+y)(x-y)/(x-y)²=(2x+y)/(x-y)=(6y+y)/(3y-y)=7y/2y=7/2

x/y=3所以x=3y(x²+2xy-3y²)/(x²-xy+y²)=(9y²+6y²-3y²)/(9y²-3y&sup

=1/2x²y³*9x²y²+4x²y²*x³y³+1/16y²*8x³y³=9/2x^4

式子是这样么(2x+y)/(x^2-2xy+y^2）=(2x+y)/(x-y)^2x-3y=0x=3y代入原式(2*3y+y)/(3y-y)^2=7/4yy不能等于0

x减1分之x平方减1,化简为x+1得2005+1=2006第二问不太清楚

原式=3分之1*(x²-3xy-10y²)=3分之1*(x-5y)(x+2y)

x-3y=0x=3y原式=(2x+y)(x-y)/(x-y)²=(2x+y)/(x-y)=(6y+y)/(3y-y)=7y/2y=7/2

(-2x²y³)²×(xy)³=4(x^4)(y^6)×x³y³=4(x^7)(y^9)

x的平方+x-6/x-3/x+3/x的平方-6-x=(x+3)(x-2)/(x-3)×(x-3)(x+2)/(x+3)=(x-2)(x+2)=x²-4x的平方+2xy+y的平方/xy-y的平

2xy²+3x³-x²yx降幂就是x的次数越来越低那么变为3x³-x²y+2xy²

=(xy-x的平方）除以(x的平方-2xy+y的平方\xy)乘以(x-y\x的平方)=-x（x-y）×xy/（x-y）²×（x-y）/x²=-y

=(x+2y)(x-2y)/(x+2)²×(x+2)/3x(x+2y)=(x-2y)/3x(x+2)=(x-2y)/(3x²+6x)

原式=(3x²+7xy+2y²)(x-2y)=(3x+y)(x+2y)(x-2y)=(3x+y)[x²-(2y)²]=(3x+y)(x²-4y

原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)

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

(x-3y)(x+y)+2xz+10yz-8z²十字相乘x-3y4z×x+y-2z所以原式=(x-3y+4z)(x+y-2z)=2

（2X的平方Y-XY）乘以3XY=6X³Y²-3X²Y²

x九次方y