找规律-51,-48,-45( ),( )
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找规律-51,-48,-45(),()找规律-51,-48,-45(),()找规律-51,-48,-45(),()-51,-48,-45,-42,-39-51减-48=3-48减-45=3-45加3=
找规律-51,-48,-45( ),( )
找规律-51,-48,-45( ),( )
找规律-51,-48,-45( ),( )
-51,-48,-45,-42,-39
-51减-48=3
-48减-45=3
-45加3=-42
-42加3=-39
-42 -39
-51,-48,-45( -42), (-39 )
后一个比前一个多3
每个加上3就可以了
依次加3,
-51,-48,-45,-42,-39
-42,-39
后一项比前一项大3
一直加3 +3 +3
-42,-39
依次加3