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时间:2013-01-02 04:23
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已知a 3x的二次方
已知A是整式,且(-1/3xyz)^2·A=1/3x^(2n+1)y^(n+3)z^3÷5x^(2n-1)y^(n+1),求A._百度作业帮
已知A是整式,且(-1/3xyz)^2·A=1/3x^(2n+1)y^(n+3)z^3÷5x^(2n-1)y^(n+1),求A.
已知A是整式,且(-1/3xyz)^2·A=1/3x^(2n+1)y^(n+3)z^3÷5x^(2n-1)y^(n+1),求A.
∵(-1/3xyz)²·A=1/3x^(2n+1)y^(n+3)z^3÷5x^(2n-1)y^(n+1) =(1/15)x^[2n+1-(2n-1)]y^[n+3-(n+1)]z³ =(1/15)x²y²z³ ∴A=(1/15)x²y²z³÷(-1/3xyz)² =(1/15)x²y²z³÷[(1/9)x²y²z²] =(3/5)z∴A=(3/5)z
∵(-1/3xyz)²·A=1/3x^(2n+1)y^(n+3)z^3÷5x^(2n-1)y^(n+1) =(1/15)x^[2n+1-(2n-1)]y^[n+3-(n+1)]z³ =(1/15)x²y²z³ ∴A=(1/15)x²y²z³÷(-1/3xyz)² =(1/15)x²y²z³÷[(1/9)x²y²z²] =(3/5)z^2∴A=(3/5)z^2已知 (-2x的m次方y的三次方)乘以(3x的三次方乘以y的平方)乘以(5x的平方y的n次方)=-30x的四次方y的3次方?_百度作业帮
已知 (-2x的m次方y的三次方)乘以(3x的三次方乘以y的平方)乘以(5x的平方y的n次方)=-30x的四次方y的3次方?
已知 (-2x的m次方y的三次方)乘以(3x的三次方乘以y的平方)乘以(5x的平方y的n次方)=-30x的四次方y的3次方?
左边 = -2x^m y^3*3x^3 y^2*5x^2 y^n = -30 x^(m+5)
y^(n+5)右边= -30x^4 y^3所以m+5 =4,n+5=3所以m= - 1,n= - 2已知单项式-8a的3x+y-z次方 b的12次方c的x+y+z次方与1/3a的4次方b的2x-y+3z次方c的6次方是同类项则x=y =z=初一下册二元一次方程组_百度作业帮
已知单项式-8a的3x+y-z次方 b的12次方c的x+y+z次方与1/3a的4次方b的2x-y+3z次方c的6次方是同类项则x=y =z=初一下册二元一次方程组
初一下册二元一次方程组
依题意得:3x+y-z=4,12=2x-y+3z,x+y+z=6解得:x=2,y=1,z=3
有6,你是初一的吧?依题意得:3x+y-z=4,12=2x-y+3z,x+y+z=6解得:x=2,y=1,z=3
您可能关注的推广已知(-1/3xyz)^2 · N=1/3x^(4n+1)y^(n+3)z^5÷5x^(2n+1)y^(n-1)z,求N_百度作业帮
已知(-1/3xyz)^2 · N=1/3x^(4n+1)y^(n+3)z^5÷5x^(2n+1)y^(n-1)z,求N
已知(-1/3xyz)^2 · N=1/3x^(4n+1)y^(n+3)z^5÷5x^(2n+1)y^(n-1)z,求N
(-1/3xyz)^2 · N=1/3x^(4n+1)y^(n+3)z^5÷5x^(2n+1)y^(n-1)z1/9x²y²z²=1/15x^2ny^4z^4=1/9x²y²z² *3/5x^(2n-2)y²z²∴N=3/5x^(2n-2) y²z²