X-(1-X分之1+X平方-1分之X立方-3X+1)/(4-X平方)
题目
X-(1-X分之1+X平方-1分之X立方-3X+1)/(4-X平方)
答案
x-[1/(1-x)+(x^3-3x+1)/(x^2-1)]/(4-x^2)=x-[-1/(x-1)+(x^3-3x+1)/(x^2-1)]/(4-x^2)=x-[-(x+1)/(x-1)(x+1)+(x^3-3x+1)/(x-1)(x+1)]/(4-x^2)=x-{[-(x+1)+(x^3-3x+1)]/(x-1)(x+1)}/(4-x^2)=x-{[-x-1+x^3-3x+1]/(x-1)(x...
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