x=-7,有=12,z=-15,则x-y-z的值为____,x-(y-z)的值____

问题描述:

x=-7,有=12,z=-15,则x-y-z的值为____,x-(y-z)的值____

解;x-y-z=-7-12-(-15)=-4
x-(y-z)=-7-(12-(-15))=-7-27=-34