无
*注意事项:
×2= 12× = ÷ = ÷ = 2÷ =
× = ÷ = ÷ = 1÷ = ÷ =
①7÷ - ÷7
②[1-( + )]×
③ ×6+ ÷
④( + - )×72
⑤( + )×7+
⑥ ÷[( + )× ]
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