Вычисли значения выражений , используя правило вычитания суммы из суммы.

(800+ 20+ 7 )- (300 + 10+ 5)
(600 + 60 + 6) - (200 + 20 +2)
(700 + 40+ 8) - (200 + 10 + 7)
(500 + 80 + 5 ) - ( 100 + 30 + 4)
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