3.(x+2)-6.(x-5)=2.(5-2x)

3x+6-6x+30=10-4x

3x-6x+4x=10-30-6

x=-26

TL

A few years ago, I went to the Temple of Literature - Quoc Tu Giam
Quoc Tu Giam is considered as the first university of Vietnam. The Temple of Literature - Quoc Tu Giam is surrounded by brick walls, the inside is divided into 5 layers of space with different architectures. Each layer of space is limited by brick walls with 3 connecting doors (including the middle door and two side doors on either side). From the outside to the inside, there are two main gates entering the Temple of Literature and Dai Trung Mon, respectively. With more than 700 years of operation, thousands of talents have been trained for the country. Today, the Temple of Literature - Quoc Tu Giam is a place to visit for domes and foreign tourists, as well as a place of commendation for excellent students and also a place to organize an annual poetry festival on the full moon day of the first month. This used to be the place where the students came to "require luck" before each exam by stroking the turtle's head at the doctor's stele. However, today, to preserve the relic, a fence was set up and the soldiers no longer performed the ritual of praying for good luck as before.

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Chúc bạn học tốt

cảm ơn bạn nhiều

112,6126126126126

<team máy tính>

112.6126126126126 NHA 

TÍNH LÂUUUUU

3. (x+2)- 6.(x-5)=2. (5-2x)

3. x+2- 6.x-5    =2.5-2x

x=

TL

<=> 2x² - 2x - x + 1 = 0

<=> 2x² - 3x + 1 = 0

=> x1 = 1 , x2 = 0,5

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Đúng r mà bạn chỉ là hình thức nhìn hơi khác th :)) Dù sao cũng cảm ơn bạn đã

a/ Xét tam giác ABD và tam giác ACD có:

AB = AC (GT)

AD: cạnh chung

BD = CD (vì D là trung điểm BC)

=> tam giác ABD = tam giác ACD (c.c.c)

/ Ta có: tam giác ABD = tam giác ACD (câu a)

=> góc ADB = góc ADC (2 góc tương ứng)

Mà góc ADB + góc ADC = 180⁰ (kề bù)

=> góc ADB = góc ADC = 180⁰ : 2 = 90⁰

Vậy AD vuông góc với BC (đpcm)

= 1200 nha em

=.  1200    Nha