Помогите

(63 сек.×5+1мин 3сек. ×6)+4ч180сек.-7200сек.
900 т.-3т20ц.÷8×(66500 кг÷19+15т.2ц.
Сроч нужно ПОЖАЛУЙСТА ПЖ ЗАРАНЕЕ СПАСИБО
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