Các bạn giúp mik với ạ

 𝐭𝐚̣̂𝐩 𝐡𝐨̛̣𝐩 𝐀 𝐠𝐨̂̀𝐦 𝐜𝐚́𝐜 𝐤𝐞̂́𝐭 𝐪𝐮𝐚̉ 𝐜𝐨́ 𝐭𝐡𝐞̂̉ 𝐱𝐚̉𝐲 𝐫𝐚 đ𝐨̂́𝐢 𝐯𝐨̛́𝐢 𝐬𝐨̂́ 𝐜𝐡𝐚̂́𝐦 𝐱𝐮𝐚̂́𝐭 𝐡𝐢𝐞̣̂𝐧 𝐭𝐫𝐞̂𝐧 𝐦𝐚̣̆𝐭 𝐱𝐮́𝐜 𝐱𝐚̆́𝐜 𝐥𝐚̀: 
𝐀 ={𝟏 𝐜𝐡𝐚̂́𝐦; 𝟐 𝐜𝐡𝐚̂́𝐦; 𝟑 𝐜𝐡𝐚̂́𝐦; 𝟒 𝐜𝐡𝐚̂́𝐦; 𝟓 𝐜𝐡𝐚̂́𝐦; 𝟔 𝐜𝐡𝐚̂́𝐦}.
𝐒𝐨̂́ 𝐩𝐡𝐚̂̀𝐧 𝐭𝐮̛̉ 𝐜𝐮̉𝐚 𝐭𝐚̣̂𝐩 𝐡𝐨̛̣𝐩 𝐀 𝐥𝐚̀ 𝟔.
𝐚) 𝐜𝐨́ 𝟑 𝐤𝐞̂́𝐭 𝐪𝐮𝐚̉ 𝐭𝐡𝐮𝐚̣̂𝐧 𝐥𝐨̛̣𝐢 𝐜𝐡𝐨 𝐛𝐢𝐞̂́𝐧 𝐜𝐨̂́ “𝐌𝐚̣̆𝐭 𝐱𝐮𝐚̂́𝐭 𝐡𝐢𝐞̣̂𝐧 𝐜𝐮̉𝐚 𝐱𝐮́𝐜 𝐱𝐚̆́𝐜  𝐥𝐚̀ 𝐬𝐨̂́ 𝐧𝐠𝐮𝐲𝐞̂𝐧 𝐭𝐨̂́”  𝐥𝐚̀ 𝟐; 𝟑; 𝟓.
 𝐱𝐚́𝐜 𝐬𝐮𝐚̂́𝐭 𝐜𝐮̉𝐚 𝐛𝐢𝐞̂́𝐧 𝐜𝐨̂́ “𝐌𝐚̣̆𝐭 𝐱𝐮𝐚̂́𝐭 𝐡𝐢𝐞̣̂𝐧 𝐜𝐮̉𝐚 𝐱𝐮́𝐜 𝐱𝐚̆́𝐜 𝐜𝐨́ 𝐬𝐨̂́ 𝐜𝐡𝐚̂́𝐦 𝐥𝐚̀ 𝐬𝐨̂́ 𝐧𝐠𝐮𝐲𝐞̂𝐧 𝐭𝐨̂́” 𝐥𝐚̀:𝟑/𝟔=𝟏/𝟐
𝐛) 𝐜𝐨́  𝐤𝐞̂́𝐭 𝐪𝐮𝐚̉ 𝐭𝐡𝐮𝐚̣̂𝐧 𝐥𝐨̛̣𝐢 𝐜𝐡𝐨 𝐛𝐢𝐞̂́𝐧 𝐜𝐨̂́ “𝐌𝐚̣̆𝐭 𝐱𝐮𝐚̂́𝐭 𝐡𝐢𝐞̣̂𝐧 𝐜𝐮̉𝐚 𝐱𝐮́𝐜 𝐱𝐚̆́𝐜  𝐥𝐚̀ 𝐬𝐨̂́ 𝐥𝐞̉” 𝐥𝐚̀  𝐥𝐚̀ 𝟏; 𝟑; 𝟓
 𝐱𝐚́𝐜 𝐬𝐮𝐚̂́𝐭 𝐜𝐮̉𝐚 𝐛𝐢𝐞̂́𝐧 𝐜𝐨̂́ “𝐌𝐚̣̆𝐭 𝐱𝐮𝐚̂́𝐭 𝐡𝐢𝐞̣̂𝐧 𝐜𝐮̉𝐚 𝐱𝐮́𝐜 𝐱𝐚̆́𝐜 𝐥𝐚̀ 𝐥𝐞̉” 𝐥𝐚̀:𝟑/𝟔=𝟏/𝟐