约分 -4x^2yz^3/16xyz^5 2（x-y)^3/y-x 通分：2/9-3a和a-1/a^2-1 已知x+1/x=3,求x^2/x^4+x^2+1的值

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约分 -4x^2yz^3/16xyz^5 2（x-y)^3/y-x 通分：2/9-3a和a-1/a^2-1 已知x+1/x=3,求x^2/x^4+x^2+1的值
约分 -4x^2yz^3/16xyz^5 2（x-y)^3/y-x 通分：2/9-3a和a-1/a^2-1 已知x+1/x=3,求x^2/x^4+x^2+1的值

约分 -4x^2yz^3/16xyz^5 2（x-y)^3/y-x 通分：2/9-3a和a-1/a^2-1 已知x+1/x=3,求x^2/x^4+x^2+1的值
第一题,写的不明白,整体是分式吗?
第二题,（2-27a）/9；（a^2+a-1）/a^2
第三题,8

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Hua, I' m very glad to have received the letter you sent me two weeks ago. To Jian Hua Dear Jian Hua, I'm very glad to have received the letter you sent me two weeks ago. I' ve been thinking about the question you asked me. In my opinion, you should come back after you finish your studies abroad.For one reason, what you are studying is badly needed nowadays in China. It will be quite easy for you to find a good job. In fact, I know a few big companies in our city are hoping to employ people like you. For another reason, I think it will be much more convenient for you to look after your parents as they are getting old. Therefore, I think it's a good idea for you to return. So what are you waiting for? Best wishes; Ming Hua

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第一题，写的不明白，整体是分式吗？
第二题，（2-27a）/9；（a^2+a-1）/a^2
第三题，8

约分8x²yz³/-32xyz^5 约分8x²yz³/-32xyz的5次方 xyz-【2xy-（3xyz-yz）+4xyz】,其中x=2,y=-1/2,z=-1 xyz-【2xy-（3xyz-yz）+4xyz】,其中x=2,y=-1/2,z=-1 约分 -4x^2yz^3/16xyz^5 2（x-y)^3/y-x 通分：2/9-3a和a-1/a^2-1 已知x+1/x=3,求x^2/x^4+x^2+1的值 XYZ满足XY/X+Y=-2,YZ/Y+Z=3/4,ZX/Z+X=-4/3,求XYZ/XY+YZ+ZX的值 -3(-x^2yz)^2*1/3x(yz)^3-(-xyz)^3*(-xyz)^2=多少(过程也要) (x-y)^4*(y-x)^3*(x-y)=?--------- (2xyz^2)^2*(-xy^2z)-(-xyz)^3*(5yz)*(-3z)=?(x-y)^4*(y-x)^3*(x-y)=？--------- (2xyz^2)^2*(-xy^2z)-(-xyz)^3*(5yz)*(-3z)=? (4x²yz^-1)²·（2xyz)^-4÷（yz³)^-2计算 (4x²yz^-1)²·（2xyz)^-4÷（yz³）^-2 约分:9xy^2+6xyz/3x^2y 3x²y-[2xyz-(2xyz-x²yz)+3x²y],其中x=-4,y=1/2,z=3 计算：(2xyz^2)^2*(-xy^2z)+(-xyz)^3*(5yz)*(-3z) (-xyz)^3×(5yz)×(-3z)+(2xyz)^2×(-xy^2z) 代数分式题1/4x-3/2x²还有3x/4yz²+1/xyz 数学题 xy&x+y =-2,yz&y+z=4&3 zx&z+x=-4&3 求XYZ%xy+xz+yz x+y分之xy=5,y+z分之yz=2分之7,z+x分之zx=4,则xy+yz+zx分之xyz=? 分式题:xy=x+y,yz=2(y+z),zx=3(z+x),求xyz/(xy+yz+xz)xy=x+y,yz=2(y+z),zx=3(z+x),求xyz/(xy+yz+xz)

约分 -4x^2yz^3/16xyz^5 2（x-y)^3/y-x 通分 ：2/9-3a和a-1/a^2-1 已知x+1/x=3,求x^2/x^4+x^2+1的值

约分 -4x^2yz^3/16xyz^5 2（x-y)^3/y-x 通分：2/9-3a和a-1/a^2-1 已知x+1/x=3,求x^2/x^4+x^2+1的值