N+1/2n+3.    Là p/s tối giản Help me pls huhu

Trạng ngữ là tới mùa đông ý nghĩa của trạng ngữ nêu rõ thời điểm xảy ra sự việc.        Xl bạn mình chỉ làm đến đc đây thui mong bạn thông cẻm

Tham  khảo nha bn 

The environment is everything around us, both natural and man-made. A major problem in the world today is the destruction of the natural environment.
This is the finished problem. We burn fuel and throw away plastic bags, which pollute. We have made factories that produce or use chemicals that are always chemical waste. They are usually poisonous and they also persist in the environment.
What must we do at school or at home to reduce pollution? For me, We can pick up litter and put it in a bin, reuse bottles and cans, use banana leaves or paper to wrap our feet, don't throw garbage in the water or on the ground. That's how we keep the school yard clean and protect the surrounding environment. good luck

(1,5:3).100=300gam

Nếu lò xo co dãn thêm 1,5 cm thì quả nặng đó coa khối lượng là:

                (1,5:3).100

B=1/4+1/5+1/6+...+1/19.       CMR B >1