Question

把被减数，减数及它们的差相加得1，如果减数是0.4，差是[ ]

1. A.
   0.6
2. B.
   1.4
3. C.
   0.1
4. D.
   0.7

Answer 1

C
解：被减数+减数+差=1减数+差+减数+差=1
0.4+差+0.4+差=1差+差=0.2差=0.1差是0.1．