120.8-{60+20.[25-(18:9+20)]mũ 2 -15 mũ 2

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1. `120.8-{60+20.[25-(18:9+20)]^2-15^2}`

   `=960-{60+20.[25-(2+20)]^2-15^2}`

   `=960-{60+20.[25-22]^2-225}`

   `=960-{60+20.3^2-225}`

   `=960-{60+20.9-225}`

   `=960-{60+180-225}`

   `=960-{240-225}`

   `=960-15=945`

    

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2. 120.8-{60+20.[25-(18:9+20)]²} -15²

   = 120.8-{60+20.[25-(2+20)]²} -15²

   = 120.8-{60+20.[25-22]²} -15²

   = 120.8-{60+20.3²} -15²

   = 120.8-180 -15²

   = 960-180 -225

   = 555

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