b: Ta có: \(\left(2+4+6+...+100\right)\cdot\left(36\cdot333-108\cdot111\right)\)

\(=\left(2+4+6+...+100\right)\cdot36\cdot111\cdot\left(3-3\right)\)

=0

\(c,\overline{735a2b}⋮̸2;⋮5\Rightarrow b=5\\ \Rightarrow\overline{735a25}⋮9\\ \Rightarrow7+3+5+a+2+5⋮9\\ \Rightarrow22+a⋮9\\ \Rightarrow a=5\\ \Rightarrow\overline{735a2b}=735525\\ b,\overline{5a27b}⋮2;⋮5\Rightarrow b=0\\ \Rightarrow\overline{5a270}⋮9\\ \Rightarrow5+a+2+7+0⋮9\\ \Rightarrow14+a⋮9\\ \Rightarrow a=4\\ \Rightarrow\overline{5a27b}=54270\)

c) \(735525\)
d) \(54270\)

Bài 7:

Gọi số bị chia và số chia lần lượt là $a$ và $b$. Theo bài ra ta có:

$a+b=275$

$a=8b+5$

$\Rightarrow 8b+5+b=275$

$9b+5=275$

$9b=270$

$b=30$

Vậy số chia là $30$

Bài 8:

a. $(5-x)y=6=1.6=6.1=2.3=3.2$. Do đó có các trường hợp sau xảy ra:

TH1: $5-x=1; y=6$

$\Rightarrow x=4; y=6$

TH2: $5-x=6; y=1$

$\Rightarrow x=-1$ (loại vì $x$ là số tự nhiên)

TH3: $5-x=2; y=3$

$\Rightarrow x=3; y=3$

TH4: $5-x=3; y=2$

$\Rightarrow x=2; y=2$

b.

$1+3+5+....+x=2500$

$[\frac{x-1}{2}+1].\frac{x+1}{2}=2500$

$\frac{(x+1)(x+1)}{4}=2500$

$(x+1)(x+1)=10000=100.100$

$\Rightarrow x+1=100$

$\Rightarrow x=99$

\(8,\\ a,\Rightarrow\left(5-x\right)y=6=2\cdot3=\left(-2\right)\left(-3\right)=1\cdot6=\left(-1\right)\left(-6\right)\)

Vậy \(\left(x;y\right)=\left\{\left(3;3\right);\left(2;2\right);\left(7;-3\right);\left(8;-2\right);\left(4;6\right);\left(-1;1\right);\left(6;-6\right);\left(11;-1\right)\right\}\)

bài này dễ mà các bn! các bn giúp hộ mik với

dễ thì bn tự lm chứ

In my freetime, I love to dance. When I was a little girl I danced all the time. My mother put me in dance school when I was 3 years old. My first dance dress was pink and it was love a ballet dress. Our dance group’s firts show was when we were 5 years old. We looked like pinguis. In 9 years we have had a lot of dance shows. I have danced for 9 years in the same dance company. But now everyone has joined other dance groups.

When I dance I forget everything else and I focus only on danceing. It was relaxing and it makes me happy. I like to take care of my body and dancing enhances your condition.

But now when I’m in High school I do not have time to dance. It’s so sad. I miss dancing . I hope that I have time to dance again day.

bạn vào google dịch cho nhanh

viết tiếng việt đi mình viết tiếng anh cho

a. 0,03                b. 1,8

a)0,3

b)9/5=1.8

a: \(\dfrac{3}{100}m=0.03m\)

b: \(1\dfrac{4}{5}km=1.8km\)

dấu đấy là song sonh nhé bạn

dấu "song song"

thanks you ''chu minh ngọc'' mình đã cho bạn 1 k