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*正数兀满足x2 =a,贝!Jx叫做。的算术平方根 即:x2 =贝Ox = ya当 d = 16 时,x = 416 = 4当 d = 196 时,x = V196 =14当a = 2时,兀二(V2)2=2I2 =1/-22 =41<V2<21.4? =1.961于=2.251.4< V2<1.51.412 =1.98811.422 =2.01641.41 <V2< 1.421.4142 =1.9993961.4152 = 2.0022251.414<j2< 1.415V2-1.41421356 (无限不循环小数)