D

A they

A healthy lifestyle is like a key to a happy life. It means eating yummy fruits and vegetables, drinking lots of water, and getting plenty of sleep at night. It is important to play outside, run, jump, and move our bodies every day. Brushing our teeth twice a day keeps them shiny and strong. We should also wash our hands before eating and after playing. A healthy lifestyle helps us feel good, stay strong, and do well in school. Just like a superhero, we can be our best when we are healthy and strong. So, let’s be healthy, happy, and strong every day!

a+1 là bội của a-1

=>\(a+1⋮a-1\)

=>\(a-1+2⋮a-1\)

=>\(2⋮a-1\)

=>\(a-1\in\left\{1;-1;2;-2\right\}\)

=>\(a\in\left\{2;0;3;-1\right\}\)

mà a là số tự nhiên

nên \(a\in\left\{2;0;3\right\}\)

what clour is it ?

• Name of my favorite food: Pho
• Main ingredients:
  • Rice noodles
  • Beef broth
  • Sliced beef or chicken
  • Herbs (basil, cilantro, mint)
  • Bean sprouts
  • Lime
  • Chili peppers
• When I often eat it:
  • Breakfast
  • Lunch
  • Dinner
  • Or anytime I crave it!
• How often I eat it:
  • A few times a week
• Why I like it:
  • Delicious flavor: The combination of rich, savory broth, tender meat, and fresh herbs creates a truly satisfying taste experience.
  • Comforting: A warm bowl of phở is perfect for a cold day or when I need a pick-me-up.

Q là tập hợp các số tự nhiên có 3 chữ số và chia hết cho 3

=>Q={102;105;...;999}

Số phần tử của Q là:

\(\dfrac{999-102}{3}+1=\dfrac{897}{3}+1=299+1=300\)(phần tử)

Ta có: \(\left(x-2020\right)^{x+1}-\left(x-2020\right)^{x+11}=0\)

=>\(\left(x-2020\right)^{x+11}-\left(x-2020\right)^{x+1}=0\)

=>\(\left(x-2020\right)^{x+1}\left[\left(x-2020\right)^{10}-1\right]=0\)

=>\(\left[{}\begin{matrix}x-2020=0\\\left(x-2020\right)^{10}=1\end{matrix}\right.\)

=>\(\left[{}\begin{matrix}x-2020=0\\x-2020=-1\\x-2020=1\end{matrix}\right.\)

=>\(\left[{}\begin{matrix}x=2020\\x=2019\\x=2021\end{matrix}\right.\)

Chọn A nha

noisy là tính từ 2 âm tiết nhưng kết thúc = y nên ta đổi y => i rồi thêm er nha

A

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