br />
2. 将X_1,X_2都减去3，变成0 1 1 1 -1。<br /><br />
3. 将X_2,X_3,X_4,X_5都加上2，变成0 3 3 3 1。<br /><br />
4. 将x_5加上2，变成0 3 3 3 3。<br /><br />
5. 将x_2,x_3,x_4,x_5都减去3，变成0 0 0 0 0。<br /><br />
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