当x=3又4/3,y=-/-9又11分之5/,z=-(+2.25),求(-x)+(-y)+z的值
问题描述:
当x=3又4/3,y=-/-9又11分之5/,z=-(+2.25),求(-x)+(-y)+z的值
答
X=165/44
y=-(416/44)
z=-(99/44)
(-x)+(-y)+z=-(165/44)+(416/44)-(99/44)=152/44