化简a-2a+3a-4a+5a-6a…+99a-100a
问题描述:
化简a-2a+3a-4a+5a-6a…+99a-100a
答
a-2a+3a-4a+5a-6a…+99a-100a
=(a-2a)+(3a-4a)+(5a-6a)…+(99a-100a)
=-a-a-a……-a
=-50a