= 1200 - (1500 . 2 + 1800 . 3 + 1800 . 2 : 3)
= 1200 - (1500 . 2 + 900 . 2 . 3 + 1800 : 3 . 2)
= 1200 - (1500 . 2 + 2700 . 2 + 600 . 2)
= 1200 - [2 . (1500 + 2700 + 600)]
= 1200 - (2 . 4800)
= 1200 - 9600
= -8400
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