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若(x+a)(x+b)=x2-kx+ab,则k的值为(  )

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K的最大值为  K.的最小值为   K.的最大值为2  K.的最小值为2  
scanf("%2d%2d%2d",&i,&j,&k);  scanf("%d %d %d",&i,&j,&k);  scanf("%d,%d,%d",&i,&j,&k);  scanf("i=%d,j=%d,k=%d",&i,&j,&k);  
scanf(“%2d%2d%2d”,&i,&j,&k);  scanf(“%d %d %d”,&i,&j,&k);  scanf(“%d,%d,%d”,&i,&j,&k);  scanf(“i=%d, j=%d,k=%d”,&i,&j,&k);  
sanf("%2d %2d %2d",&i,&j,&k);  scanf("%d %d %d",&i,&j,&k);  scanf("%d,%d,%d",&i,&j,&k);  scanf("i=%d,j=%d,k=%d",&i,&j,&k);  
scanf ("%2d%2d%2d",&i,&j,&k);  scanf ("%d %d %d",&i,&j,&k);  scanf ("%d,%d,%d",&i,&j,&k);  scanf ("i=%d,j=%d,k=%d",&i,&j,&k);  
scanf("%d %d %d",&i,&j,&k);  scanf("%d,%d,&d",&i,&i,&k);  scanf("%2d %2d %2d",&i,&j,&k);  scanf("i=%d,j=%d,k=%d",&i,&j,&k);  
scanf ("%2d%2d%2d",&i,&j,&k);  scanf ("%d %d %d",&i,&j,&k);  scanf ("%d,%d,%d",&i,&j,&k);  scanf ("i=%d,j=%d,k=%d",&i,&j,&k);  
scanf("%d %d %d",&i,&j,&;  scanf("%d,%d,&d",&i,&i,&;  scanf("%2d %2d %2d",&i,&j,&;  scanf("i=%d,j=%d,k=%d",&i,&j,&;  
K的最大值为  K.的最小值为   K.的最大值为2  K.的最小值为2  
scanf(“%2d%2d%2d”,&i,&j,&k);  scanf(“%d%d%d”,&i,&j,&k);  scant(“%d,%d,%d”,&i,&j,&k);  scanf(“i=%d,j=%d,k=%d”,&i,&j,&k);  
sanf("%2d %2d %2d",&i,&j,&;  scanf("%d %d %d",&i,&j,&;  scanf("%d,%d,%d",&i,&j,&;  scanf("i=%d,j=%d,k=%d",&i,&j,&;  

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