负6.37*72.5+18.2*6.37-63.7*4.57=

题目

负6.37*72.5+18.2*6.37-63.7*4.57=
英语：根据句意及首字母提示完成句子.
I am a student of No.1 Middle s______
用所给单词的适当形式填空
How ______(do)you spell it?
please ______(call)Mary at 878 1108.
The keys ______(be)Bobs.
Is this ______(you)dictionary?
My ID card ______(be)lost.

答案

负6.37*72.5+18.2*6.37-63.7*4.57
=-6.37*72.5+18.2*6.37-6.37*45.7
=6.37*(-72.5+18.2-45.7)
=6.37*(-100)
=-637