Giải hộ mình Đề: Rút gọn biểu thức

Giúp mình phần period 2 I với ạ

Xác định số hạt p ,n ,e mang điện âm ,hạt mang điện dương và tổng số hạt trong nguyên tử của nguyên tố sau biết: a) Neon có số khối là 20, số p=n

Calli : Những ngôi sao xa xôi :)) Vừa mới học bài này xong hay lắm lun ý

Calli chữ:"Tắm mưa" NL:Mưa thế này tui ra ngoài đạp xe.Bây h về ướt sũng.Huhuhu

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My parents..... Up their business when they Were Young and they are quite successful now

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Give the correct form of the word in brackets to complete the following sentences : 1, A tour of the theatre is available by prior ________ . ( arrange ) 2, There was an air of ________ about him . ( fragile ) 3, Don't let him ________ you like he did at the last party . ( monopoly ) 4, North - west of our country is a _______ region . ( mountain ) 5, It's ________ for apple trees to flower so early . ( usual ) 6, He's not very good at _______ his worries . ( share ) 7, There was a complete _______ sitting at my desk . ( strange ) 8, That afternoon we went _______ on the desk . ( skate ) 9, Popular water sports include swimming , _______ and water - skiing . ( surf ) 10, Planing permission is not ______ needed . ( usual )

Tính: 9 + 9 + 9 + ... + 9 – 998 111 số hạng ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………...................................................................................................................