Question

1.下面两个数互为相反数的是( ).A.-1/2和0.2 B.-1/3和-0.333 C.-2.25和二又四分之一 D.

Answer 1

A.-1/2和0.2 (-0.5,0.2)

B.-1/3和-0.333 (-1/3,-0.333)

C.-2.25和二又四分之一 (-2.25,2.25)

D.5和-（-5）(5,5)

可见选择C