若X为整数,且有2.5小于x的绝对值小于或等于7,则x等于?

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若X为整数,且有2.5小于x的绝对值小于或等于7,则x等于?
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若X为整数,且有2.5小于x的绝对值小于或等于7,则x等于?
若X为整数,且有2.5小于x的绝对值小于或等于7,则x等于?

若X为整数,且有2.5小于x的绝对值小于或等于7,则x等于?
x>=0
2.5

+/-(3,4,5,6,7)

x>=0
2.5x=3,4,5,6,7
x<0
2.5<-x<=7
-7<=x<-2.5
x=-7,-6,-5,-4,-3
所以x=-7,-6,-5,-4,-3,3,4,5,6,7

2.5 < |x| <= 7 及 x 为整数
<=> ( 2.5< x 或 -2.5 > x ) 及 -7<=x<=7 及 x 为整数
考虑 x<0
x = -3,-4,-5,-6,-7
考虑 x<0
x = 3,4,5,6,7

x = --7,-6,-5,-4,-3, 3,4,5,6,7