a) Ba đường thẳng phân biệt cắt nhau tại O tạo thành 6 tia chung gốcSố góc tạo ra là:  

Trong đó có 3 góc bẹt nên còn lại: 

Vậy có 12 góc không kể góc bẹt được tạo thành 

Spring comes at the end when Tet comes back all over the homeland. The weather is warmer. Trees started to sprout. In my garden, the flowers bloomed in full bloom. Butterfly flocks come from nowhere, making the garden more vibrant. The sound of birds chirping on the trees is delightful. Everywhere, people are eager to go shopping to celebrate Tet. The street is splendidly decorated. The whole family cleans the house together to welcome the coming new year. New Year's Eve, everyone in the family has a year-end meal together. Adults reflect on the past year, children laugh and laugh. Everyone is looking forward to the moment of New Year's Eve. Every house is filled with a warm, crowded Tet holiday. I love the Tet holiday of my country so much.

hì

Gọi khối lượng 3 thanh kim loại đó là 

Vì Ba thanh kim loại có tổng khối lượng là 144kg

Nên a+b+c=144

Mà khối lượng của ba thanh tỉ lệ nghịch với 2, 4, 6.

➩ a.2 = b.4 = c.6

➩\(\dfrac{a.2}{24}\) = \(\dfrac{b.4}{24}\)= \(\dfrac{c.6}{24}\)

➩ \(\dfrac{a}{12}\) = \(\dfrac{b}{6}\) = \(\dfrac{c}{4}\)

Áp dụng tính chất dãy tỉ số bằng nhau ta có:

 \(\dfrac{a}{12}\) = \(\dfrac{b}{6}\) = \(\dfrac{c}{4}\) = \(\dfrac{a+b+c}{12+6+4}\) =\(\dfrac{144}{22}\) = \(\dfrac{72}{11}\)

➩ a = \(\dfrac{72}{11}\).12=...

     b = \(\dfrac{72}{11}\).6=...

     c = \(\dfrac{72}{11}\).4=...

Vậy...

mà câu này số lớn thật sự

A, xin lỗi mình không để ý.

https://hoidap247.com/cau-hoi/1524711

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