yòuguānxì :r(x,y)s(x,y)
rs
abcbcd
a1b1c2b1c2d1
a1b2c3b2c1d1
a1b2c1b2c3d2
......
r÷s dejiēguǒwéi a1
x xiāngdāngyú ay xiāngdāngyú b,cz xiāngdāngyú d
'ànzhàochúyùnsuànguīzé, wǒmenbùbìguānzhù d
zhǐxūbǐjiào b,c dāng s guānxìzhōngde b,c suǒyòudezǔhé (b1,c2)(b2,c3)(b2,c1) dūchūxiànzài r guānxìzhōngshí , jiēguǒcáiwéi a
No. 2
yòuguānxì :R(x,y)S(x,y)
RS
ABCBCD
a1b1c2b1c2d1
a1b2c3b2c1d1
a1b2c1b2c3d2
......
R÷S dejiēguǒwéi a1
x xiāngdāngyú Ay xiāngdāngyú B,Cz xiāngdāngyú D
'ànzhàochúyùnsuànguīzé, wǒmenbùbìguānzhù D
zhǐxūbǐjiào B,C dāng S guānxìzhōngde B,C suǒyòudezǔhé (b1,c2)(b2,c3)(b2,c1) dūchūxiànzài R guānxìzhōngshí , jiēguǒcáiwéi A