帮忙解一道初中数学计算题计算:1/x-1/(x+2)-1/(2-x)
问题描述:
帮忙解一道初中数学计算题
计算:1/x-1/(x+2)-1/(2-x)
答
原式=1/X-1/X-1/2-1/2+X
=X-1
答
1/x
答
-1/X
答
right
答
1/x-1/(x+2)-1/(2-x)
=1/x-1/(x+2)+1/(x-2)
=1/x+4/(x^2-4)
=(x^2+4x-4)/(x^3-4x)