-3a+3a=-3( ),2a-2a=2( ),-5a-5a=-5( ),4a+4a=4( )
人气:452 ℃ 时间:2019-10-09 00:36:15
解答
-3a+3a=-3(a-a ),
2a-2a=2(a-a ),
-5a-5a=-5(a+a ),
4a+4a=4(a+a )
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