b) (2 789 + 1 134 + 7 202 + 866) × 200
Giải thích
(2 789 + 1 134 + 7 202 + 866) × 200
= [(2 798 + 7 202) + (1 134 + 866)] × 200
= (10 000 + 2 000) × 200
= 12 000 × 200
= 2 400 000.
(2 789 + 1 134 + 7 202 + 866) × 200
= [(2 798 + 7 202) + (1 134 + 866)] × 200
= (10 000 + 2 000) × 200
= 12 000 × 200
= 2 400 000.