下列计算中,错误的是( ▲ )
A.(-7)-(-2)=-5
B.︱-2︱-2=-4
C.-7-2="-9"
D.-2-(-7)=5
答案:B
A.(-7)-(-2)=-7+2=-5,故正确
B.︱-2︱-2=2-2=0,故错误
C.-7-2="-9" 正确
D.-2-(-7)=-2+7=5,故正确
故选B
下列计算中,错误的是( ▲ )
A.(-7)-(-2)=-5
B.︱-2︱-2=-4
C.-7-2="-9"
D.-2-(-7)=5
答案:B
A.(-7)-(-2)=-7+2=-5,故正确
B.︱-2︱-2=2-2=0,故错误
C.-7-2="-9" 正确
D.-2-(-7)=-2+7=5,故正确
故选B