= (2021+2029) + (2022+2028) + (2023+2027) + (2024+2026) + 2025
= 4050 + 4050 + 4050 + 4050 + 2025
= 8100 + 4050 +4050 + 2025
= 12 150 + 4050 + 2025
= 16 200 +2025
= 18 225
nếu đúng tick dùm mik nhé
2021+2029+2022+2028+2023+2027+2024+2026+2025
Bằng bao nhiêu bạn tự tính ra nhé
2021+2022+2023+2024+2025+2026+2027+2028+2029
=(2021+2029)+(2022+2028)+(2023+2027)+(2024+2026)+2025
=4050+4050+4050+4050+2025
=4050.4+2025
=16200+2025
=18225
#Toán lớp 5=(2021+2029)+(2022+2028)+(2023+2027)+(2024+2026)+ 2025
= 4050 + 4050 + 4050 + 4050 + 2025
= 18225
HT
2021 + 2022 + 2023 + 2024 + 2025 + 2026 + 2027 + 2028 + 2029
= ( 2021 + 2029 ) + ( 2022 + 2028 ) + ( 2023 + 2027 ) + ( 2024 + 2026 ) + 2025
= 4050 + 4050 + 4050 + 4050 + 2025
= 4050 x 4 + 2025
= 16200 + 2025
= 18225
=