简算.438-58+42
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简算.438-58+42
简算.438-58+42
简算.438-58+42
438-58+42
=438+42-58
=480-58
=422
438-(58-42)
=438-16
=422
简算.438-58+42
简算.438-58+42
简算.438-58+42
438-58+42
=438+42-58
=480-58
=422
438-(58-42)
=438-16
=422