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若X→Y,X→Z,则X→YZ 若XY→Z,则X→Z,Y→Z 若X→Y,Y→Z,则X→Z 若X→Y,Y'
Y,则X→Y'
若X→4Y,X→Z,则X→YZ 若XY→Z,则X→Z,Y→Z 若X→Y,Y→Z,则X→Z 若X→Y,Y'
Y,则X→Y'
x=4,y=3;x=7,y=8 x=3,y=4;x=7,y=8 x=7,y=8;x=4,y=3 x=8,y=7;x=7,y=8
2x-y+7=0和x-3y-4=0 x-2y+7=0和3x-y-4=0 x-2y+7=0和x-3y-4=0 2x-y+7=0和3x-y-4=0
pre(x)<pre(y)和post(x)<post(y) pre(x)<pre(y)和post(x)>post(y) pre(x)>pre(y)和post(x)<post(y) pre(x)>pre(y)和post(x)>post(y)
x=x+y y=y+x x=x+y x=x+y y=x-y x=x-y x=x+y y=y-x x=x-y x=x-y y=x-y x=y-x
x=4,y=3;x=7,y=8 x=3,y=4;X=7,y=8 x=7,y=8;x=4,y=3 x=8,y=7;x=7,y=8
仅II和IV 仅I、III和IV 仅II和VI 仅IV、V和VI
x=4,y=3;x=7,y=8 x=3,y=4;X=7,y=8 x=7,y=8;x=4,y=3 x=8,y=7;x=7,y=8
pre(x)<pre(y)和post(x)<post(y) pre(x)<pre(y)和post(x)>post(y) pre(x)>pre(y)和pos(x)<post(y) pre(x)>pre(y)和post(x)>post(y)
pre(x)>pre(y)和post(x)>post(y) pre(x)>pre(y)和post(x)<post(y) pre(x)<pre(y)和post(x)>post(y) pre(x)<pre(y)和post(x)<post(y)
x=0000007FH,y=FFF9H,z=00000076H x=0000007FH,y=FFF9H,z=FFFF0076H x=0000007FH,y=FFF7H,z=FFFF0076H x=0000007FH,y=FFF7H,z=00000076H
若X→Y,X→Z,则X→YZ 若XY→Z,则X→2,Y→Z 若X→Y,Y→Z,则X→Z 若X→Y,Y'
Y,则X→Y,
pre(x)<pre(y)和post(x)<post(y) pre(x)<pre(y)和post(x)>post(y) pre(x)>pre(y)和post(x)<post(y) pre(x)>pre(y)和post(x)>post(y)
x=4,y=3;x=7,y=8 x=3,y=4;x=7,y=8 x=7,y=8;x=4,y=3 x=8,y=7;x=7,y=8
y=﹣ y=﹣x+5 y=﹣x y=﹣x2(x<0)