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2022-06-06 18:33:41
Đặt A=1-2-3+4-5-6+7-8-9+...+49-50-51
A=(1-2-3)+(4-5-6)+(7-8-9)+...+(49-50-51)
A=(-4)+(-7)+(-10)+...+(-52)
SSH trong dãy là: (52-4):3+1=17
Tổng là: [(-52)+(-4)].17:2=-476
Chúc bạn học tốt
2022-06-06 18:27:29
A=15+16+17+...+2021+202
A-202=15+16+17+...+2021
A-202=(2021+15).[(2021-15):1+1]:2
A-202=2036.2007:2
A-202=2043126
A=2043126+202
A=2043328
Nếu đề bài lỗi ở chỗ 202==>2022 thì sẽ như sau
A= 15+16+17+...+2021+2022
A=(2022+15).[(2022-15):1+1]:2
A=2037x2008:2
A=1045148
Chúc bạn học tốt