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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;
C1-C4b-C2b-C3b C4b2b3b C5b-C6-C7-C8 C5b-C6-C7-C8-C9
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 * C = C * B * A- =A * B * C - C * B * A = *A = B = C - C = B = A* A * B * C = C * B * A
∵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)
C1-C4b-C2b-C3b C4b2b3b C5b-C6-C7-C8 C5b-C6-C7-C8-C9
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=
+(a-b+c)=a+b+c +(a-b+c)=-a+b-c -(a-b+c)=-a+b+c -(a-b+c)=-a+b-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;
a+b+c ﹣a+3b﹣c a+b﹣c 2b﹣2c
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;