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Câu hỏi của Hân Niô - Toán lớp 5 - Học toán với OnlineMath

Giải

a) Ta có :

1 + 2 + 2² + ... + 2⁷

= (1 + 2) + 2² .(1 + 2) + ... + 2⁶ . (1 + 2)

= 3 + 2² . 3 + ... 2⁶ . 3 \(⋮\)3

cau b nua ban

neu giai duoc thi giai con khong thi minh tu giai cung duoc

Mui Ne, which is one of famous beaches in Vietnam, is in Binh Thuan province. It has the nice beach and beautiful sand dunes with different colors: white and yellow. The beach has the nice scenery with pure water, coconut trees, white sand and rocks. You can go there by coach and it usually takes around 4-5 hours to get there. You can swim, play on the sand with sand skidding games, or do surfing in the sea. It’s a great place for you to entertain after hard-studying time.

This travel guide is for people who want to visit Ha Long Bay, one of the seven natural wonders in the world. Ha Long Bay is located in Quang Ninh province which is in the north of Vietnam. It is nearly 200km from Hanoi. So it takes you about 4 hours by car. You can also travel there in a coach or even in a helicopter on Saturday. The best season to visit Ha Long is in summer when the weather is warm and sunny. Ha Long Bay has many beautiful caves and islands; therefore, you must take a boat trip to enjoy the view here. You certainly must take pictures to remember the trip better, too. If you are an active person, you must do the water sports here swimming, sailing, and windsurfing. One more thing, you must try the seafood here because it is incredibly fresh and delicious. With this travel guide, I hope that you will have a wonderful time here in the number one natural wonder of Vietnam.

 ba mươi bốn trăm nghĩa là gì?

ba mưới bốn trăm ( four-sided hundred) ?

=2400

Gọi số học sinh là a

a-1 chia hết 3

a-2 chia hết 4

a-3 chia hết 5

a-5 chia hết 7

a+2 thuộc BC (3; 4; 5; 7)

4=2²

BCNN (3; 4; 5; 7) =2² .3.5.7=420

B (420) thuộc (0; 420; 840;1680;2100;2520;..)

mà 2500<a<2600 nên a +2 = 2520

a= 2520 -2= 2518

Vậy số học sinh trường đó là 2518

bạn có tên ko

tk cho mink nha

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sai rồi bạn ạ

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quá hạn