wirite four sentences about your last summr vacation( English 7)
Mình cần gấp🙏🙏🙏🙏
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Người ta không nói rõ chỉ biết là 18 ông thì đều lấy hiệu là Hùng vương hết
a. x2 - 2x
⇔ x(x - 2)
b. 3x - 6y
⇔ 3(x - 2y)
c. 5(x + 3y) - 15x(x + 3y)
⇔ (5 - 15x)(x + 3y)
d. 3(x - y) - 5x(y - x)
⇔ 3(x - y) + 5x(x - y)
⇔ (3 + 5x)(x - y)
4b.
\(\dfrac{\pi}{2}< a< \pi\Rightarrow cosa< 0\Rightarrow cosa=-\sqrt{1-sin^2a}=-\dfrac{4}{5}\)
\(\Rightarrow tana=\dfrac{sina}{cosa}=-\dfrac{3}{4}\)
\(tan\left(a+\dfrac{\pi}{3}\right)=\dfrac{tana+tan\left(\dfrac{\pi}{3}\right)}{1-tana.tan\left(\dfrac{\pi}{3}\right)}=\dfrac{-\dfrac{3}{4}+\sqrt{3}}{1-\left(-\dfrac{3}{4}\right).\sqrt{3}}=...\)
c.
\(\dfrac{3\pi}{2}< a< 2\pi\Rightarrow cosa>0\Rightarrow cosa=\sqrt{1-sin^2a}=\dfrac{5}{13}\)
\(cos\left(\dfrac{\pi}{3}-a\right)=cos\left(\dfrac{\pi}{3}\right).cosa+sin\left(\dfrac{\pi}{3}\right).sina=\dfrac{1}{2}.\dfrac{5}{13}+\left(-\dfrac{12}{13}\right).\dfrac{\sqrt{3}}{2}=...\)
#include <bits/stdc++.h>
using namespace std;
double a,b;
int main()
{
cin>>a>>b;
cout<<(a+b)*2;
return 0;
}
Bài 1:
Vì AD là p/g góc A nên \(\widehat{A_1}=\widehat{A_2}=\dfrac{1}{2}\widehat{BAC}=30^0\)
Mà \(\widehat{A_2}+\widehat{C}+\widehat{D_1}=180^0\Rightarrow\widehat{D_1}=180^0-30^0-40^0=110^0\)
Mà AE//BC nên \(\widehat{EAD}=\widehat{D_1}=110^0\left(so.le.trong\right)\)
Vì DE//AC nên \(\widehat{A_2}=\widehat{D_2}=30^0\left(so.le.trong\right);\widehat{D_3}=\widehat{C}=40^0\left(đồng.vị\right)\)
Vì AE//BC nên \(\widehat{D_3}=\widehat{E}=40^0\)
Vậy các góc tg ADE là \(\widehat{A}=110^0;\widehat{D}=30^0;\widehat{E}=40^0\)
Bán kính hình tròn:
\(18,84:3,14:2=3\left(cm\right)\)
Diện tích hình tròn:
\(3\times3\times3,14=28,26\left(cm^2\right)\)
Đường kính hình tròn:
\(3\times2=6\left(cm\right)\)
Diện tích hình thoi:
\(\dfrac{6\times6}{2}=18\left(cm^2\right)\)
Diện tích phần gạch chéo:
\(28,26-18=10,26\left(cm^2\right)\)
Last summer, I and my friends go to Vung Tau by motobike. we have two interesting days in Vung Tau city. We start my trip on 6h AM. After 1 hour, We get to Long Thanh stop stations. we have stopped there for 15 minutes anh drink fresh cow's milk. Then we continue my trip to vung tau city. after 1 hour we get vung tau city. many hotel and motel but we had to spend hard 1 hour to look up a hotel for staying. the hotel which we stay is a small nice hotel, from our hotel we can see the beach and it had a good view. Because we have a long trip by motobike so that we are very tired. after check in we only want to sleeping. I don't know, what do other peoples do but when I wake up and walk to outside. I see my friends drinking coffee. at that 2 o'clock PM. we have spent 2 hours for drinking coffee after that we go to the beach to swim. at the evening, we have a round in vung tau by motobike. verybody want to see vung tau by night until 10 o'clock we return back our hotel. and all night, we play card togethe. on the morning tomorrow. we walk to the beach and swim with the local peoples and anothe tourists. after that we go to coffee shop and chat togethe. until 12 o'clock we have lunch and 3 o'clock we come back to hcm city. we arrived hcm at 5 o'clock. we bye togethe. and end 2 interesting day in vung tau.
Mik làm hơi nhiều câu -.-
Last Summer vacation, I went home with my family to visit my grandparents a few weeks later, and I went with them to visit some tourist destinations and beautiful scenic places Danang. Because there are many good games at amusement parks, delicious food and extremely interesting places. It was a great summer vacation.