（2/3-5/9×3/8）x16/7 160×7/16-5x5/6

（2/3-5/9×3/8）x16/7
=（2/3-5/24）x16/7
=11/24x16/7
=22/21

160×7/16-5x5/6
=70-4又1/6
=65又5/6

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