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2022-11-09 21:32:56
5+52+53+...+512
=(5+52)+(53+54)+...+(511+512)
=(5.1+52.1)+(52.5+52.52)+...+(510.5+510.52)
=1.(5+52)+52.(5+52)+...+510.(5+52)
=1.30+52.30+...+510.30
=30.(1+52+...+510):30
Vậy (5+52+53+...+512) chia hết cho 30
2022-11-09 21:02:55
A=1+3+3^2+3^3+...+3^20
3A=3+3^2+3^3+...+3^21
3A - A=(3+3^2+3^3+...+3^21) - 1+3+3^2+3^3+...+3^20
2A=3^21 - 1
2022-05-15 13:26:15
Chiều cao mảnh đất đó là
25 :5 x 3 = 15 (m)
Diện tích mảnh đất đó là
25 x 15 = 375 (m)
Đ/s: 375 m
"Ez"
2022-05-15 13:21:16
5/7×10/7 - 3/7 x 5/7
=5/7 × (10/7-3/7)
=5/7 x 7/7
=5/7 x 1
= 5/7.
Câu trả lời đó, chỉ cần chép vào thôi.