Giải thích các bước giải:
$VT=(\frac{1}{a}+3a)+(\frac{1}{b}+3b)+(\frac{1}{c}+3c) -2(a+b+c)$
Ta có: $$a^2+b^2+c^2 =1 \ge \frac{(a+b+c)^2}{3} ⇔ 1 \ge \frac{a+b+c}{\sqrt[]{3}} ⇔a+b+c \le \sqrt[]{3}$$
Áp dụng bất đẳng thức $AM-GM$:
$⇒VT \ge 2\sqrt[]{3}+2\sqrt[]{3}+2\sqrt[]{3}-2.\sqrt[]{3} =4\sqrt[]{3}$
$=>$Điều phải chứng minh.
Giúp em vs anh chị huhu em không biết giải
cali: nii123 - digi not tradi - tone xanh dương - có trang trí
V. Rearrange the words to make meaningful sentences. 1. Playing/and / the / is / room / the guitar / Ba / in / learning / music / to. 2. dinner / like / come / would / to / house / you / to / for / my? 3. this time tomorrow/ English/ They/ will/ be learning. 4. doesn’t like/ ice-skating/ because/ my brother/ dangerous/ he/ it is/ thinks. 5. people/ until/ flying cars/ use/ won’t/ year 2050.
Combine these sentences using “too + adj + to V” or “adj + enough + to V” 8. The dress is so dirty. She can’t wear it. ........................................................................... 9.The film is very good. The children won’t miss it. ....................................................................................................................................... 10. Those shoes are large. You can wear them. ....................................................................................................................................... 11. He is very strong. He can carry all these things. ............................................................................................
Supply the correct form of the verbs in the brackets. Làm giải thích cho mình nha. 1. She's a good manager because she never avoids...... ( deal) with the problems of her staff. 2. I imagine .......(go) back to the 20th century and ....... (witness) the construction of Cu Chi Tunnels. 3. We recommed........ (book) early , as this is a popular event. 4. Youngters nowadays seem ........(lack) awareness of protecting the public. 5. A lot of small towns in the area are definitely worth.........(visit) 6. E-mail allows us ......( send) messages all aroud the world quickly and easily. 7. On the way to Hue , we stopped.........(pay) a visit to a relative in Da Nang. Giúp mk vs ạ. Mk cảm ơn
giúpppppppppppppppppppppppppppppppppppppppppppppppppppp
giúp vs ạ giúp em với ạ huhu em cần gấp ai giúp em bank 1k mua kẹo nè
|x-5|-|x-2|+|2x+1|= x+2 làm hộ gấp lém
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