作业帮已知多项式4xy-3x²-xy y² x²
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/14 20:14:50
1:已知多项式x^2+2axy-xy^2与多项式3xy-axy^2-y^3的和不含xy项所以2a=-3a=-3/2x^2+2axy-xy^2+3xy-axy^2-y^3=x^2-xy^2+1/2xy^
=-x-(2y-2+3x)+2(x+4)=-x-2y+2-3x+2x+8=-4x-2y+10
A=3x^2y-4xy^2B=-x^2y-2xy^2A+B=3x^2y-4xy^2-x^2y-2xy^2=2x^2y-6xy^2A+B+C=0C=-(A+B)=-(2x^2y-6xy^2)=6xy^2
(x+y)²=4x²+2xy+y²=4x²+y²-6=4x²+y²=101/2(x²+y²)-xy=1/2x1
已知x+y=3xy=2那么-x²y-xy²=-xy(x+y)=-2*3=-6如果不懂,祝学习愉快!
根据“多项式1\4乘x^2乘y^2m+1-3x^2+xy^3-1是关于xy的五次多项式”得2m+1=3解得m=1根据“关于xy的单项式2\3xy的n+1次方的次数与这个次数相同”得n+1=4解得n=3
x+y分之xy=2,则xy/(x+y)=2xy=2x+2y(-x+3xy-y)分之(3x-5xy+3y)=(3x-5xy+3y)/(-x+3xy-y)=[3x-5(2x+2y)+3y)/[-x+3(2
解2(x+3y-2xy)-(4x+8y-2xy)=2x+6y-4xy-4x-8y+8xy=-2x-2y+4xy=-2(x+y)+4xy=-2×5+4×3=12-10=24x²-3y²
-2x²-2x+xy+y²
3|x+1|+2(y-1)^2=0x+1=0y-1=0x=-1y=1(x^2+4xy-2y^2)-(x^2+y)-2(y^2+xy)-1/2(x-8y^2)=x^2+4xy-2y^2-x^2-y-2y
X^2+AXY-XY^2+3XY-AXY^2-y^3=X^2+(A+3)XY-(A+1)XY^2-y^3不含XY项,所以A+3=0A=-3所以和=X^2+2XY^2-y^3
-2x^2y(-1/6x^2y^2+3xy^2-xy)+xy=1/3x^4y^3-6x^2y^3+2x^3y^2+xy
x²-3k（1）xy-3y²+k（2）y-4x与多项式-3y²+1/3xy+4y+4x-8的和中不含xy项和y的一次项x²-3k（1）xy-3y²+k
x+y=-5,xy=63xy^2+3x^2y=3xy(y+x)=3×6×(-5)=-90
已知多项式3x²y-4xy²+x的三次方-1（1）按y的降幂排列-4xy²+3x²y+x³-1;（2）按y的升幂排列x³-1+3x²
（1）-xy²+2x²y+3x³-4y³=3x³+2x²y-xy²-4y³（2）-xy²+2x²y+
∵x-y=4xy，∴2x+3xy-2yx-2xy-y=2(x-y)+3xyx-y-2xy=8xy+3xy4xy-2xy=112．故答案为：112．
M=(2x^2y+xy^2)（x-2y)-(2x^2-3xy+xy^2)(-xy)很简单啊.
（2x+3y-2xy)-(x+4y+xy)-(3xy+2y-2x)=2x+3y-2xy-x-4y-xy-3xy-2y+2x=(2x-x+2x)+(3y-4y-2y)-(2xy+xy+3xy)=3x-3