Think about it this way: x < y < z
Difference between y and x is more than 5 so it is at least 6. But x is even and y is odd so their difference would be odd. Hence the diff between them will be at least 7.
Now z is greater than y by at least 2 (since z is odd too), hence diff between x and z is at least 9.
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y-x>5可得出y>x+5，因为x是偶数，偶数+奇数为奇数，y是奇数，则y>=x+5+2
z,y都是奇数，z>=y+2，则z>=x+5+2+2
这道题有陷阱， 根绝题目可得。x+1小于等于y，y+2小于等于2 ， 可得。x
假设x=2，则y最小等于9，z最小等于11，所以11-2=9
Think about it this way: x < y < z
Difference between y and x is more than 5 so it is at least 6. But x is even and y is odd so their difference would be odd. Hence the diff between them will be at least 7.
Now z is greater than y by at least 2 (since z is odd too), hence diff between x and z is at least 9.
y>5+x 但由于5+x是奇数 y也是奇数 所以y≥5+x+2 那么z≥5+x+2+2
y+2小于等于z，同时减去x，可得z-x大于等于8，这里注意陷阱，z-x奇偶性质决定，一定是奇数，所以8排除，上推9，选d