计算307+290+301+297+295+304+302+209,可以先把每个加数都看作( )计算.
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![计算307+290+301+297+295+304+302+209,可以先把每个加数都看作( )计算.](/uploads/image/z/108270-54-0.jpg?t=%E8%AE%A1%E7%AE%97307%2B290%2B301%2B297%2B295%2B304%2B302%2B209%2C%E5%8F%AF%E4%BB%A5%E5%85%88%E6%8A%8A%E6%AF%8F%E4%B8%AA%E5%8A%A0%E6%95%B0%E9%83%BD%E7%9C%8B%E4%BD%9C%28++++++++%29%E8%AE%A1%E7%AE%97.)
计算307+290+301+297+295+304+302+209,可以先把每个加数都看作( )计算.
计算307+290+301+297+295+304+302+209,可以先把每个加数都看作( )计算.
计算307+290+301+297+295+304+302+209,可以先把每个加数都看作( )计算.
看作300计算