计算3a+(1+a-2分之1)×a-1分之a²-2a

问题描述:

计算3a+(1+a-2分之1)×a-1分之a²-2a

3a+(1+a-2分之1)×a-1分之a²-2a
=3a+(a-2+1)/(a-2)×a(a-2)/(a-1)
=3a+(a-1)/(a-2)×a(a-2)/(a-1).约分
=3a+a
=4a