(负三分之一xy)乘[xy(2x-y)-2x(xy-y平方)]
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/12 20:09:36
后面没打上啊,是说乘以y^2吗?若是的话我想应该这么解由已知可得(x^2-y^2)^2=x^2y^2,则x^4+y^4=3x^2y^2x^2/y^2+y^2/x^2=(x^4+y^4)/x^2y^2=
再答:再答:刚那个错的,你都不检查,题目也不知道对不对,还是很感谢你的评价!
-1/2(4xy-8x^2y^2)+1/3(xy-x^2y^2)=-2xy+4x^2y^2+1/3xy-1/3x^2y^2=-1又2/3xy十3又2/3x^2y^2
x=-1/5y=-1/35x²y-2xy²-3xy-2xy-5x²y+2xy²=-5xy=-5(-1/5)(-1/3)=-1/3
您好:-3*2x²-xy+4*x²+xy-6=-6x²-xy+4x²+xy-6=-2x²-6如果本题有什么不明白可以追问,如果满意请点击“选为满意答案
[XY(2X-Y)的平方-(-XY的二次方)的二次方]除以8XY=[(2x-y)²-xy³]÷8=[(-2/3-1)²+1/3*1]÷8=(25/9+1/3)÷8=28/
2x的四次方乘y的三次方减x的三次方乘y的四次方.=x³y³(2x-y)=(xy)³(2x-y)=2³x1/3=8/3在右上角点击【评价】,然后就可以选择【满意
x+(xy-4x)-3y=x-4x-3y+xy=-3(x+y)+xy=1-3=-2
(y/x)×√(xy)×y×[(-3/2)√(x³y)]÷[(1/3)√(y/x)]=(y²/x)×(-9/2)×x²√(yx)=(-9/2)xy²√(xy)
因为〔〕-〔X^2+3XY〕=-XY-1/3Y^2,求被减数为多少,被减数=X^2+3XY+(-XY-1/3Y^2)=X^2+3XY-XY-1/3Y^2=X^2+2XY-1/3Y^2
唉,肯定是老师布置的作业了,还拿来问百度啊?!自己想.
不含xy项就是说含XY的项为0即3kxy+三分之一xy=0解得K=-(1/9)
解-1/3x(xy²+y+x³y的4次方)=-1/3x[(xy)y+y+(xy)³×y]=-1/3x(y+y+y)=-1/3x*3y=-xy=-1
(负三分之一xy)²[xy(2x-y)-2x(xy-y²)]=1/9x²y²(2x²y-xy²-2x²y+2xy²)=1
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=(x+y)²/xy×(x-y)²/y(x+y)=(x+y)(x-y)
2x²+3xy+y²=2x²+2xy+xy+y²=2(x²+xy)+(xy+y²)=2×(-1/2)+3=-1+3=2
xy^2*(-x^2y^2)(1/2xy^3)^2=-xy^2*x^2y^2*1/4x^2y^6=-1/4x^5y^10(xy^2)^5=x^5y^10当xy^2=2时,原式=-1/4*2^5=-1/
负四分之一XY+0.09XY=-0.25XY+0.09XY=(-0.25+0.09)XY=-0.16XY
4x²y×((-xy)²)³=4x²y×x^6×y^6=4x^8y^7
(-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