Số bé x 1,25 = Số lớn

Ta đặt số bé là: A còn số lớn là: B

⇒ A/B = 100/125 = 4/5 (Đổi 1,25 = 125%)

Hiệu của 2 số là 13,86. Suy ra 1 phần sẽ bằng 13,86

Số bé là: 13,86 x 4 = 55,44

Số lớn là: 13,86 x 5 = 69,3

Đ/S:...

Câu hỏi đâu bạn ơi :)

Có gì bạn tự giải nốt nhé

21 điểm nhé

ta có: 1/2=1/1x2

          1/6=1/2x3

           1/12=1/3x4

             1/20=1/4x5

             1/30=1/5x6

                1/42=1/6x7

                 1/56=1/7x8

              1/72=1/8x9

               1/90=1/9x10

                1/110=1/10x11

              tiếp theo bn tiếp tục nhé

1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110

=1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10+1/10x1

=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11

=1-1/11

=10/11

cảm ơn 2 bạn nhé

\(\left(169-4^2\right).\left(169-5^2\right)...\left(169-13^2\right)\)

Mà \(13^2=169\)

\(\Rightarrow\left(169-4^2\right)\left(169-5^2\right)...\left(169-169\right)\)

\(=\left(169-4^2\right)\left(169-5^2\right)...0\)

\(=0\)

thôi ko cần nữa tớ có câu tl rồi nếu có ai cần thì đây nhé !

a: \(=\dfrac{-5}{17}+\dfrac{-30}{170}=\dfrac{-5}{17}-\dfrac{3}{17}=\dfrac{-8}{17}\)

b: \(=\dfrac{5}{12}+\dfrac{6}{12}=\dfrac{11}{12}\)

c: \(=\dfrac{-2\cdot3+5}{15}\cdot\dfrac{3\cdot7-3\cdot2}{14}\)

\(=\dfrac{-1}{15}\cdot\dfrac{15}{14}=\dfrac{-1}{14}\)

d: \(=\dfrac{3}{2}\cdot\dfrac{4}{3}\cdot\dfrac{5}{4}=\dfrac{5}{2}\)

e: \(=\dfrac{1}{5}\cdot10-\dfrac{1}{3}\cdot\dfrac{24-45}{20}\)

\(=2-\dfrac{1}{3}\cdot\dfrac{-21}{20}=2+\dfrac{7}{20}=\dfrac{47}{20}\)

Để kim giờ và phút gặp nhau thì phải đúng vào lúc 12h

Thời gian 2 kim gặp nhau là:

12-2 =10 (giờ)

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

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