cho a+b=1 tìm GTNN của a⁴+b⁴ (schwarz dạng engel)

cho a+b=1. tìm GTNN của a⁴+b⁴ (Schwarz dạng engel)

help me

tìm lỗi sai :

1.before she became a film star, she has been a stand-up comedian

2.My family lived in Hue since 1990 to 1996, but we are now living in saigon

3.Computers are often used to control, adjustment anh correct complex industrial operation

4.Since i begin school , I haven't had much free time

5.they asked me what did happen last night, but i was able to tell them

và giải thích hộ mình với nha