化简(X方-2X分之X+2.
化简(X方-2X分之X+2-X方-4X+4分之X-1)除以X分之X-4,其中,
X=负2分之5
人气:221 ℃ 时间:2020-06-13 21:59:44
解答
[(x+2)/(x^2-2x)-(x-1)/(x^2-4x+4)]/[(x-4)/x]=[(x+2)/x(x-2)-(x-1)/(x-2)^2]*[x/(x-4)]={[(x+2)(x-2)-x(x-1)]/x(x-2)^2}*[x/(x-4)]=[(x^2-4-x^2+x)/x(x-2)^2*[x/(x-4)]=(x-4)*x/[x(x-2)^2(x-4)]=1/(x-2)^2=1/(-5/2-...
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