once upon the time , there was a beautiful princess .she live in a castle on the mountain . one day , a prince passing the castle and he saw that princess.but she guarded by the witch could not get out .the prince withdrew the sword and killed the witch. Finally ,they lived happily togerther forever.

---A golden egg story:

One day a countryman going to the nest of his Goose found there an egg all yellow and glittering.

When he took it up it was as heavy as lead and he was going to throw it away, because he thought a trick had been played upon him.

But he took it home on second thoughts, and soon found to his delight that it was an egg of pure gold.

Every morning the same thing occurred, and he soon becam rich by selling his eggs.

As he grew rich he grew greedy; and thinking to get at once all the gold the Goose could give, he killed it and opened it only to find, nothing.

Greed often overreaches itself: Tham quá thì thâm

THE STORY OF MAI AN TIEM

First, King Hung ordered Mai An Tiem and his family to live on an sland. The island was very far away.

Then one day, An Tiem found some black seeds and he grew them. The seeds gave watermelons.

Next, An Tiem's family exchanged the watermelons for food and drink.

In the end, King Hung heard about the story and he let An Tiem and his family go back home.

O1=O2( vì 2 góc đối đỉnh)

O3 và O4 thì làm theo cách hai góc kề bù

Vd :O1+O3=180 độ (2 góc kề bù)

Suy ra :120 độ +O3=180 độ

Vậy từ đó tính ra đc O3 ,tương tự O4 cũng vậy

b) Để P nguyên thì \(\sqrt{x}+5⋮3\sqrt{x}-1\)

\(\Leftrightarrow3\sqrt{x}+15⋮3\sqrt{x}-1\)

\(\Leftrightarrow16⋮3\sqrt{x}-1\)

\(\Leftrightarrow3\sqrt{x}-1\in\left\{-1;1;2;4;8;16\right\}\)

\(\Leftrightarrow3\sqrt{x}\in\left\{0;2;3;5;9;17\right\}\)

\(\Leftrightarrow3\sqrt{x}\in\left\{0;3;9\right\}\)

\(\Leftrightarrow\sqrt{x}\in\left\{0;1;3\right\}\)
hay \(x\in\left\{0;1;9\right\}\)

1: \(A=-\dfrac{1}{3}\cdot3\cdot x\cdot x^3\cdot y\cdot z^2=-x^4yz^2\)

2: \(A=-1^4\cdot\left(-1\right)\cdot2^2=4\)

a. Vì nhiệt kế y tế dùng để đo nhiệt độ con người. Mà nhiệt độ con người nằm trong khoảng \(34^0C-42^0C\), nên.........

b. \(50^0C=122^0F;72^0C=161,6^0F;30^0C=86^0F;97^0C=206,6^0F\)

c. \(320^0F=160^0C;392^0F=200^0C\)

3,

a) Tại vì nhiệt độ của cơ thể người không nhỏ hơn 34^oC và lớn hơn 42^oC

b) 50^oC = 50 . 1,8 + 32 = 122^oF

    72^oC = 72 . 1,8 + 32 = 161,6^oF

    30^oC = 30 . 1,8 + 32 = 86^oF

    97^oC = 97 . 1,8 + 32 = 206,6^oF

c) 320^oF = (320 - 32) . \(\dfrac{5}{9}\) = 160^oC

    392^oF = (392 - 32) . \(\dfrac{5}{9}\) = 200^oC

a, Vì nhiệt kế y tế chỉ đo thân người nên chỉ có \(34^o\rightarrow42^o\) thôi.

b,\(50^oC=32+\left(50.1,8\right)=122^oF\)

\(72^oC=32^oF+\left(73.1,8\right)=405^oF\)

\(30^oC=86^oF\)

\(97^oC=2066^oF\)

c,Lm nốt nha , m lười quá!

giúp mình câu c câu d với