右键就行 自动打
a^3 a^2 - a - 10^0 = a\"\' a\" - a - 1 = a\"( a 1 ) - ( a 1 ) = ( a 1 )( a\" - 1 ) = ( a 1 )\"( a - 1 ) a\"\' a\" - a - 10 = a\"\' - 8 a\" - a - 2 = ( a - 2 )( a\" 2a 4 ) a\" - 2a a - 2 = ( a - 2 )( a\" 2a 4 ) a(。