\(\left(\dfrac{1}{2}-1\right).\left(\dfrac{1}{3}-1\right)...\left(\dfrac{1}{2022}-1\right).\left(\dfrac{1}{2023}-1\right)\)

= \(\left(-\dfrac{1}{2}\right).\left(-\dfrac{2}{3}\right)...\left(-\dfrac{2021}{2022}\right).\left(-\dfrac{2022}{2023}\right)\)

= \(\dfrac{-1}{-2023}\) (đã triệt tiêu)

= \(\dfrac{1}{2023}\)

câu của pecil là sai kết quả ra là -1 ]2023

Mandy have more than Adeline:

90 - 40 = 50 ("money unit")

At first, Adeline had:

50 : (7 - 3) x 3 = 37,5 ("money unit")

At first, Mandy had:

50 : (7 - 3) x 7 = 87,5 ("money unit")

Answer: Adeline: 37,5 "money unit"

              Mandy: 87,5 "money unit"

Giúp mình gấp nha !

cảm ơn nhìu

a. Sơ đồ khối

  b.

- Đầu vào: 3 số a, b, c

- Đầu ra: Giá trị trung bình cộng của a, b, c

=> The name of the robot is funny.

The name of your robot is Funny

\(A=\dfrac{1}{100}-\dfrac{1}{99\cdot100}-\dfrac{1}{99\cdot98}-...-\dfrac{1}{3\cdot2}-\dfrac{1}{2\cdot1}\)

\(=\dfrac{1}{100}-\left(\dfrac{1}{1\cdot2}+\dfrac{1}{2\cdot3}+...+\dfrac{1}{98\cdot99}+\dfrac{1}{99\cdot100}\right)\)

\(=\dfrac{1}{100}-\left(1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{98}-\dfrac{1}{99}+\dfrac{1}{99}-\dfrac{1}{100}\right)\)

\(=\dfrac{1}{100}-\left(1-\dfrac{1}{100}\right)=\dfrac{1}{100}-\dfrac{99}{100}=-\dfrac{98}{100}=-\dfrac{49}{50}\)

The police knew the man killed his wife because when they called him to the crime scene, he went straight to the garden without any indication from the police about where the crime had occurred. His knowledge of the specific location of the crime (the garden) before being told by the police served as an indication that he was involved in the murder.

Giải:

Lượng muối có trong mỗi lít nước biển = 1.026Kg x 2,5 % =0.02565kg

Số lít nước biển cần để có 513Kg muối là:

L= 513/ 0.02565 = 20.000 lít

Đáp số: 20.000 lít nước biển