a³-(-a²+2a-1)
= a³+a²-2a+1 (除括号)
=a³-2a+a²+1 (移项,符号连同一起移)
=(a³-2a)+(a²+1)
求代数式a³-(-a²+2a-1)= 的值
求代数式a³-(-a²+2a-1)= 的值
a³-(-a²+2a-1)= ﹙_________﹚+(a²+1)
a³-(-a²+2a-1)= ﹙_________﹚+(a²+1)
数学人气:913 ℃时间:2020-02-22 15:51:18
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