Gấp ai làm nhanh và đúng nhận ngay 3 tick ngay và luôn
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NM
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Những câu hỏi liên quan
NM
1
5 tháng 12 2021
a: Xét ΔBHD vuông tại H và ΔENC vuông tại N có
BD=EC
\(\widehat{BDH}=\widehat{ECN}\)
Do đó: ΔBHD=ΔENC
N
19 tháng 11 2021
\(=\dfrac{\left[\dfrac{2}{3}\cdot\left(-\dfrac{3}{4}\right)\right]^2\cdot\dfrac{2}{3}\cdot\left(-1\right)}{\left[\dfrac{2}{5}\cdot\left(\dfrac{-5}{12}\right)\right]^2\left(-\dfrac{5}{12}\right)}=\dfrac{\left(-\dfrac{1}{2}\right)^2\left(-\dfrac{2}{3}\right)}{\left(-\dfrac{1}{6}\right)^2\left(-\dfrac{5}{12}\right)}\\ =\dfrac{\dfrac{1}{4}\left(-\dfrac{2}{3}\right)}{\dfrac{1}{36}\left(-\dfrac{5}{12}\right)}=\left(-\dfrac{1}{6}\right):\left(-\dfrac{5}{432}\right)=\dfrac{72}{5}\)
CA
11 tháng 9 2017
3^42 : 2^81 = 3^:(2^2)
suy ra 3^42 < 2^81
mình đúng nhớ cho điểm đó
J
17 tháng 10 2016
ta thấy 1978 ko chia hết cho 11
78 ko chia hết cho 11 suy ra a chia hết cho 11
2012 ko chia het cho 11
10 ko chia het cho 11
suy ra chắc chắn b chia hết cho 11 ( ĐPCM)
k nha
28 tháng 10 2016
\(1978a+2012b-78a-10b=1900a+2002\)
ma 2002b chia het cho 11
=>1900a chia het cho 11 nhung 1900 khong chia het cho 11
=>a chia het cho 11 (1)
ta co 78a+10b chia het cho 11 ma 78a chia het cho 11
=>10b chia het cho 11 ma 10 khong chia het cho 11
=>b chia het cho 11 (2)
tu (1) va (2) =>a+b chia het cho 11
NN
Nguyễn Ngọc Anh Minh
CTVHS
VIP
16 tháng 5 2022
Số cần tìm bớt đi 1 đơn vị được số mới chia hết cho 2; 3; 5; 7
Số mới là
2x3x5x7=210
Số cần tìm là
210+1=211
NH
1
2 tháng 12 2016
\(\frac{\left(25-15\right)^2-\left(-35\right)}{15-\left(2^0+2^3\right)}=\frac{135}{6}=\frac{45}{2}\)
7 tháng 10 2019
My best friend is my classmate at school. She and I have been studying together since we entered school in kindergarten. We have studied together all these years. We also travel by the school bus together because we stay close to each other. Her home is only a ten minute walk from my place.My friend is kindly and sweet-natured. We are always happy to ewith each other. We enjoy studying, playing and eating together. If I am sad she will do all she can to make me smile and feel happy.She has always been kind and helpful to me. When I miss school because I am unwell she comes to my place to share with me all that has been done at school. When she misses school I too help her with all that has been covered at school. We also play badminton together in the evenings.
7 tháng 10 2019
I have a best friend named Linh, we have been together since we were just little kids. She has beautiful bright skin and brown eyes. We have a lot of things in common, such as we love the same band, food and books. She and I even share the same name, and it is a small surprise for anyone who has talked to us. Linh is not my classmate, but we always help each other with the homework and school projects. We spend every minute in our break time to talk about all the things that happen in class, and people usually ask what can even makes us laugh that hard. Sometimes I think it is we have been best mates since forever, and I hope that we will be happy this for a very long time.