Lê Michael
Vài giây trước

`2/3 + 2/15 + 2/35 + 2/63`

`=2/(1.3)+2/(3.5) + 2/(5.7) + 2/(7.9)`

`=1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9`

`=1-1/9`

`=9/9-1/9`

`=8/9`

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phuc anh

I. Rewrite the sentences so that they have the same meaning as the original ones.

         1.     We will use renewable energy in the future.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        ...

Xét tam giác ABH và tam giác ACH có 

AB = AC ; AH_chung 

Vậy tam giác ABH = tam giác ACH (ch-cgv)

bạn viết rõ đề ra nhé 

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_silverlining
14 phút trước

He usually gets up 
He never goes
Do you always go to bed
I sometimes go to bed
I often get up

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a, \(\left(x+y\right)^2-4xy\ge0\Leftrightarrow\left(x-y\right)^2\ge0\)

Dấu ''='' xảy ra khi x = y 

c, \(2a^2+2b^2+2c^2\ge2ab+2bc+2ca\)

\(\Leftrightarrow\left(a-b\right)^2+\left(b-c\right)^2+\left(c-a\right)^2\ge0\)

Dấu ''='' xảy ra khi a = b = c 

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