Câu hỏi của Từ Đức Mạnh

Question

Tính:A=1.5.6+2.10.12+4.20.24+9.45.54  /  1.3.5+2.6.10+4.12.20+9.27.45B=1/1.300 +1/2.301 +1/3.302 +...+1/101.400   /   1/1.102 +1/2.103 +1/3.104 +...+1/299.400

Quân Bá Đạo FC · Accepted Answer

LOZ.bạn ra bài khó quá mình giai ko đượcCâu trả lời: LOZ.bạn ra bài khó quá mình giai ko được

Đỗ Hoàng Minh · Answer

A=11.300+12.301+13.302+...+1101.400�=11.300+12.301+13.302+...+1101.400A=1299.(11−1300+12−1301+13−13012+...+1101−1400)�=1299.(11−1300+12−1301+13−13012+...+1101−1400)A=1299.(11−1400)�=1299.(11−1400)A=1299.399400�=1299.399400A=399119600�=399119600B=11.102+12.103+13.104+...+1299.400�=11.102+12.103+13.104+...+1299.400B=1101.(11−1102+12−1103+....+1299−1400)�=1101.(11−1102+12−1103+....+1299−1400)B=1101.(11−1400)�=1101.(11−1400)B=1101.399400�=1101.399400B=39940400�=39940400⇒AB=39911960039940400=101299Câu trả lời: A=11.300+12.301+13.302+...+1101.400�=11.300+12.301+13.302+...+1101.400A=1299.(11−1300+12−1301+13−13012+...+1101−1400)�=1299.(11−1300+12−1301+13−13012+...+1101−1400)A=1299.(11−1400)�=1299.(11−1400)A=1299.399400�=1299.399400A=399119600�=399119600B=11.102+12.103+13.104+...+1299.400�=11.102+12.103+13.104+...+1299.400B=1101.(11−1102+12−1103+....+1299−1400)�=1101.(11−1102+12−1103+....+1299−1400)B=1101.(11−1400)�=1101.(11−1400)B=1101.399400�=1101.399400B=39940400�=39940400⇒AB=39911960039940400=101299

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