mk hox giỏi tiếng anh nhất lp nè😊 😊 😊 😊 😊 😊 😁 😁 😁 😁

thì sao

mk nè! 

thi gì bạn

5: Thay x=21 và y=3000 vào y=ax+b, ta được:

a*21+b=3000

=>21a+b=3000

Thay x=21-1=20 và y=3000+30=3030 vào y=ax+b, ta được:

20a+b=3030

=>21a+b-20a-b=3030-3000

=>a=30

21a+b=3000

=>b+630=3000

=>b=3000-630=2370

Vậy: y=30x+2370

a: =>12x+5(x-1)=100-10(3x-1)

=>12x+5x-5=100-30x+30

=>17x-5=-30x+130

=>47x=135

=>x=135/47

b: \(\Leftrightarrow6\left(2x-1\right)+2\left(5-x\right)=24-9\left(x+1\right)\)

=>12x-6+10-2x=24-9x-9

=>10x+4=-9x+15

=>19x=11

=>x=11/19

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I love China for its incredible blend of ancient history and cutting-edge modernity. First, the country is home to breathtaking landmarks like the Great Wall and the Forbidden City, which tell stories of a rich cultural heritage spanning thousands of years. Second, I am fascinated by Chinese cuisine; the diversity of flavors, from spicy Sichuan dishes to delicate Dim Sum, is truly impressive. Finally, the rapid development of its high-tech cities and the hospitality of the people make it a vibrant and welcoming place to explore. For me, China is a destination where tradition and the future meet in a unique and inspiring way.