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a×b=    ×    ;(a×b)×C=    ×(    ×     ).

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b﹣c,b+c  ﹣b+c,b﹣c  b﹣c,b﹣c  ﹣b+c,b+c    
if(a>b)c=a;a=b;b=c;  if(a>b)c=a,a=b,b=c;  if(a>b)c=a,a=b,b=c;  if(a>b)c=a;a=b;b;c;  
k=(a<b)((a<c)a:c):((b<c)h:c);  k=(a<b)((b<c)a:b):((h>c)b:c);  k=(a<b)a:b;k=(b<c)b:c;  k=(a<b)a:h:k=(a<c)a:c;  
k=(a<b) a:b; k=(b<c) b:c;  k=(a<b) ((b<e) a:b) : ((b>c) b:c);  k=(a<b) ((a<c) a:c) : ((b<e) b:c);  k=(a<b) a:b; k=(a<c) a:c;  
k=(a<b)a:b;k=(b<c)b:c;  k=(a<b)((b<c)a:b):((b>c)b:c);  k=(a<b)((a<c)a:c):((b<c)b:c);  k=(a<b)a:b;k=(a<c)a:c;  
k=(a<b) a:b;k=(b<c)b:c;  k=(a<b)((b<c)a:b):((b>c)b:c);  k=(a<b)((a<c)a:c):((b<c)b:c);  k=(a<b)a:b;k=(a<c)a:c;  
a=b, b=a  a=c, b=a, c=b  a=c, b=a, c=a  c=a, a=b, b=c  
-A * B * C = C * B * A-  =A * B * C - C * B * A =  *A = B = C - C = B = A*  A * B * C = C * B * A  
if(a>b)c=a,a=b,b=c;  if(a>b){c=a,a=b,b=c;}  if(a>b)c=a;a=b;b=c;  if(a>b){c=a;a=b;b=c;}  
∵a∥b,b∥c,∴a∥c   ∵a⊥b,b⊥c,∴a∥c   ∵a∥b,b⊥c,∴a⊥c   ∵a⊥b,b⊥c,∴a⊥c  
-(a+b+c)(b-c-a)(a+c-b)(a+b-c)  -(a-b+c)(b+c-a)(a+c-b)(a+b-c)  -(a+b+c)(b+c-a)(a+c-b)(a+b-c)  (a+b+c)(b+c-a)(a+c-b)(a+b-c)  
a+b﹣c=a﹣(b﹣c)  a+b+c=a﹣(b+c)   a﹣b+c﹣d=a﹣(b﹣c+d)  a﹣b+c﹣d=(a﹣b)﹣(c﹣d)  
if(a>b)c=a,a=b,b=c;  if(a>b)c=a,a=b,b=c;  if(a>b)c=a;a=b;b=c;  if(a>b)c=a;a=b;b=c;  
if(a>b)c=a,a=b,b=c;  if(a>b)c=a,a=b,b=c;  if(a>b)c=a;a=b;b=c;  if(a>b)c=a;a=b;b=c;  
if(a>b) c=a,a=b,b=c;  if(a>b)c=a,a=b,b=c;  if(a>b) c=a;a=b;b=c;  if(a>b)c=a;a_b;b=c;  
-C*B*A=C*B*A-  -A*B*C=C*B*A-  =C*B*A-C*B*A=  =A*B*C-C*B*A=  
if(a>b) c=a, a=b, b=c;  if(a>b) c=a, a=b, b=c;  if(a>b) c=a; a=b; b=c;  if(a>b) c=a; a=b; b=e;  
k=(a<b) a:b; k=(b<c) b:c;  k=(a<b) ((b<e) a:b) : ((b>c) b:c);  k=(a<b) ((a<c) a:c) : ((b<e) b:c);  k=(a<b) a:b; k=(a<c) a:c;  
k=(a<b)  a:b;k=(b<c)b:c;  k=(a<b)((b<c)a:b):((b>c)b:c);  k=(a<b)((a<c)a:c):((b<c)b:c);  k=(a<b)a:b;k=(a<c)a:c;  

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