2a四次反-( 3a²-(2a-1) ) 去括号
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2a四次反-(3a²-(2a-1))去括号2a四次反-(3a²-(2a-1))去括号2a四次反-(3a²-(2a-1))去括号2a四次反-(3a²-(2a-1)
2a四次反-( 3a²-(2a-1) ) 去括号
2a四次反-( 3a²-(2a-1) ) 去括号
2a四次反-( 3a²-(2a-1) ) 去括号
2a四次反-( 3a²-(2a-1) )
=2a四次反-( 3a²-2a+1 )
=2a四次反-3a²+2a-1