1-5×(-1)²+6 化简:(2a+3)-(a-1)+2a
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1-5×(-1)²+6 化简:(2a+3)-(a-1)+2a
1-5×(-1)²+6 化简:(2a+3)-(a-1)+2a
1-5×(-1)²+6 化简:(2a+3)-(a-1)+2a
1-5×(-1)²+6
=1-5×1+6
=-4+6
=2
(2a+3)-(a-1)+2a
=2a+3-a+1+2a
=3a+4