x/(x+3)-x/(3-x)=18/(x平方-9)
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x/(x+3)-x/(3-x)=18/(x平方-9)
x/(x+3)-x/(3-x)=18/(x平方-9)
x/(x+3)-x/(3-x)=18/(x平方-9)
x/(x+3)-x/(3-x)=18/(x平方-9﹚
x/﹙x+3﹚+x/﹙x-3﹚=18/﹙x+3﹚﹙x-3﹚
x﹙x-3﹚+x﹙x+3﹚=18
2x²=18
x=±3
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
x+(x+3)+2x+(2x-18)=255
计算1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=?
3x*x=1600+x*x-80x
(X+1)X(X+2)X(X+3)=504
一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X
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1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2x+18
1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2x+18