数学作业-7-(+7)-(-15)-1这题怎么做

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数学作业-7-(+7)-(-15)-1这题怎么做数学作业-7-(+7)-(-15)-1这题怎么做数学作业-7-(+7)-(-15)-1这题怎么做-7-(+7)-(-15)-1=-7-7+15-1=-1

数学作业-7-(+7)-(-15)-1这题怎么做
数学作业-7-(+7)-(-15)-1这题怎么做

数学作业-7-(+7)-(-15)-1这题怎么做
-7-(+7)-(-15)-1
=-7-7+15-1
=-14+14
=0

-7-(+7)-(-15)-1=-7-7+15-1=0

先-7-(+7)=-7-7=-14.然后-14-(-15)=-14+15=1.(因为负负得正)再1-1=0,所以最后答案为0