当x=3又3/4,y=-丨-9又5/11丨,z=-(+2.25),求(-x)+(-y)+z的值
问题描述:
当x=3又3/4,y=-丨-9又5/11丨,z=-(+2.25),求(-x)+(-y)+z的值
答
x=3又3/4,y=-9又5/11,z=-2.25=-2又1/4
所以-x-y+z=-3又3/4+9又5/11-2又1/4=9又5/11-6=3又5/11