来自洪金海的问题
【下列去括号的各式中①x+(-y+z)=x-y+z;②x-(-y+z)=x-y-z;③x+(-y+z)=x+y+z;④x-(-y+z)=x+y-z正确的是()A.①②B.②③C.③④D.①④】
下列去括号的各式中①x+(-y+z)=x-y+z;②x-(-y+z)=x-y-z;③x+(-y+z)=x+y+z;④x-(-y+z)=x+y-z正确的是()
A.①②
B.②③
C.③④
D.①④
1回答
2019-12-27 12:33