1.My house is quipped with many modern ____________. (APPLY) 2.No one can ensure the _____________ of extraterrestrials in other planets. (EXIST) 3.The window will _____________ close if it is too hot outside. (AUTOMATIC) 4.Wi-fi stands for _____________ fidelity. (WIRE) 5. Some __________________ devices such as smart phone or wireless TV are very beneficial for our lives these days. (TECHNOLOGY) 6.The company attracted thousands of _______________ who applied for this job position. (APPLY) 7.This dishwasher is the most _____________ type of machine available. (ADVANCE) 8.Robots are very ____________ for our lives as they can replace people in many labour jobs. (USE) 9.Some hi-tech machines can even do household chores more _______________ than people. (PRODUCE) 10.All of the medical ____________ must be sterilized before use. (EQUIP)

\(\dfrac{-2}{7}-\dfrac{1}{4}\)

\(\dfrac{-1}{2}.\dfrac{4}{9}+\dfrac{3}{7}\div\dfrac{15}{14}\)

\(\left(\dfrac{-3}{4}+\dfrac{7}{10}\right)\div\left(\dfrac{-1}{5}\right)-\dfrac{2}{9}\)

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Hứa tick 15 lần

Cho B =1;3;5;7;....;2017;2019 Hỏi trong các số 2B - 1; 2B; 2B + 1 số nào là số chính phương?

Bài 5. Thực hiện phép tínhM =1+ (−2) + 3+ (−4) +...+ 2019 + (−2020) + 2021

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Hứa tick cho 10 lần

Đa tạ

z tỉ lệ thuận với y theo hệ số tỉ lệ k nên ta có z = k.y

y tỉ lệ thuận với x theo hệ số tỉ lệ h nên ta có y = h.x

Do đó z = k.y = k.(h.x) = (k.h).x

Vậy z tỉ lệ thuận với x theo hệ số tỉ lệ k.h