Tính các tổng sau 1+2+3+4+...+n 1+3+5+7+...+n(2n+1) 2+4+6+8+...+2n

giúp mik vs ạ đầy đủ cho 5 sao ạ cảm ơn

Tiếp ạ 😅😅😅😅😅😅😅😅😅😅 giúp e với

Rewrite the sentences in pasive voice . 1.They visited this museum yesterday. 2.I am watching a football match now. 3.Pam has found the keys the table. 4.Mona is washing the clothes now. 5.You have made a lot of mistakes. 6.Bill will bring sandwiches. 7.They attend lectures every day. 8.We are meeting the relatives now. 9.He will copy this text. 10.He has bought a new car. 11.We are playing volley ball now. 12.Our teacher explained the rule. 13.She translates the texts every day. 14.She is watching a comedy flim now. 15.He put the candle on the table. 16Pam has bought a new ring recently. 17.He will correct the mistakes. 18.I have got a beautiful present. 19.The cat dropped the vase yesterday. 20.I am playing the piano now.

a,(x+4)-(x+1)*(x-1)=16 b,(2x-1)^2+(x+3)^2-5*(x+7)*(x-7)=6

Cho các oxit sau:HgO,Al2O3,SO2,CaO,CO2,P2O5,K2O,CuO,SO3,NaOH,H2SO4,H2O,Ca(OH)2,HCI,Fe3O4,Fe2O3,ZnO,FeO,N2O5,SiO2,HNO3,PbO a. Oxit nào tdv với H2O b. Oxit nào tdv vs HCI, H2SO4,HNO3 c.Oxit nào tdv vs KOH, Ba(OH)2 Viết PTHH

Câu 1: Sáng tác một tác phẩm (câu chuyện hoặc bài thơ) nhằm khích lệ mọi người đọc sách (Khuyến khích thí sinh vẽ tranh minh họa)

Viết các phần tử bằng cách chỉ ra tính chất đặc trưng của mỗi phần tử: a) E = {0;2;4;6;8;.....} b) F ={10;11;12;....20}

Write a story : Your story Will begin With this sentences : It Was my first time in the jungle and I Was so excited....

a,5(x^2 - 3x+1) + x ( 1-5x) = x-2 b, 3x( 4/3x+1) - 4x ( x-2 ) =10 c, 5x(1/5x -2)+3(6-1/3x^2)=12