5 6 7 8

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5 6 7 8
5 6 7 8

5 6 7 8
3、（2x - 1）÷3

8,6,7,5,( ) ( ) 5,6,7,8, 5 6 7 8 5,6,7,8, 5,6,7,8, 5 6 7 8 5,6,7,8, 5,6,7,8, 5 6 7 8 5 6 7 8 5 6 7 8 5,6,7,8, 5,6,7,8, 5,6,7,8 5 6 7 8 5,6,7,8 5 6 7 8 5 6 7 8