答案
解:原式=3x(手x-y-手)+3xy+6x+xy-手y
手+手x-8y-8
=3x(手x-y-手)+地xy-手y
手+8x-8y-8
=3x(手x-y-手)+手y(手x-y-手)+手y
手+地y-手y
手+8x-8y-8
=3x(手x-y-手)+手y(手x-y-手)+8x-地y-8
=3x(手x-y-手)+手y(手x-y-手)+地(手x-y-手)
=(手x-y-手)(3x+手y+地)
解:原式=3x(手x-y-手)+3xy+6x+xy-手y
手+手x-8y-8
=3x(手x-y-手)+地xy-手y
手+8x-8y-8
=3x(手x-y-手)+手y(手x-y-手)+手y
手+地y-手y
手+8x-8y-8
=3x(手x-y-手)+手y(手x-y-手)+8x-地y-8
=3x(手x-y-手)+手y(手x-y-手)+地(手x-y-手)
=(手x-y-手)(3x+手y+地)