简便运算,13.9-3.87/5/0.387=好的话加100分,

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简便运算,13.9-3.87/5/0.387=好的话加100分,

简便运算,13.9-3.87/5/0.387=好的话加100分,
简便运算,13.9-3.87/5/0.387=
好的话加100分,

简便运算,13.9-3.87/5/0.387=好的话加100分,
13.9-3.87/0.387/5
=13.9-10/5
=13.9-2
=11.9
OK?

11.9

13.9-3.87/5/0.387
=13.9-(3.87/0.387)/5
=13.9-10/5
=13.9-2
=11.9