15,16,17,19

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15,16,17,1915,16,17,19 15,16,17,1915.a/b,a2+b216.0或4/317.0123199n-9+n=10n-9求采纳,

15,16,17,19
15,16,17,19
 

15,16,17,19
15.a/b,a2+b2
16.0或4/3
17.0123
199n-9+n=10n-9求采纳,