简便计算:(-2007)×(-53 又 51/52)+1678×(-53又51/52)-329×53 又 51/52
1个回答

(-2007)×(-53 又 51/52)+1678×(-53又51/52)-329×53 又 51/52

=(-2007+1678+329)×(-53 又 51/52)

=0×(-53 又 51/52)

=0

a★b=-a×b-(a+b),

3★4即a=3,b=4

3★4=3×4-(3+4)=5

所以(3★4)★(-5)

=5★(-5)

=5×(-5)-[5+(-5)]

=-25-0

=-25