500/a-500/(a+10)
=500(a+10)/a(a+10)-500a/a(a+10)
=(500(a+10)-500a)/a(a+10)
=(500a+5000-500a)/a(a+10)
=5000/(a^2+10a)
100%正确
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500/a-500/(a+10)
=500(a+10)/a(a+10)-500a/a(a+10)
=(500(a+10)-500a)/a(a+10)
=(500a+5000-500a)/a(a+10)
=5000/(a^2+10a)
100%正确
很高兴为您解答,67320163为您答疑解惑
如果本题有什么不明白可以追问,