ta có : (ghi lại đề)

=6+12+18+24+30/3+6+9+12+15

=2*(3/3+6/6+9/9+12/12+15/15)

=2*(1+1+1+1+1)

=2*5=10

chúc main học tốt nhé

hi

\(\frac{5}{11}+\frac{1}{14}+\frac{2}{5}+\frac{6}{11}+\frac{3}{4}+\frac{6}{25}+\frac{9}{25}\)

\(=\frac{5}{11}+\frac{6}{11}+\frac{1}{14}+\frac{3}{4}+\frac{2}{5}+\frac{6}{25}+\frac{9}{25}\)

\(=1+\frac{23}{28}+1\)

\(=\frac{79}{28}\)

Bạn có thể xem ở đây : Tại đây

=1/14 +1/4+(2/5+6/25+9/25)+(6/11+5/11)

=4/64+16/64+1+1

=20/64+1+1

=5/16+1+1

=2 và 5/16

\(\frac{5}{11}+\frac{1}{14}+\frac{2}{5}+\frac{6}{11}+\frac{3}{4}+\frac{6}{25}+\frac{9}{25}\)

\(=\left(\frac{5}{11}+\frac{6}{11}\right)+\left(\frac{1}{14}+\frac{3}{4}\right)+\left(\frac{6}{25}+\frac{9}{25}\right)+\frac{2}{5}\)

\(=1+\frac{23}{28}+\frac{3}{5}+\frac{2}{5}\)

\(=1+\frac{23}{28}+1\)

\(=2+\frac{23}{28}\)

\(=\frac{79}{28}\)

Ai k mik mik k lại

\(\frac{79}{28}\)nha bạn

Cho mình sửa lại đề tí nhé bạn , nếu có gì sai liên hệ với mình !

\(\frac{5}{11}+\frac{1}{4}+\frac{2}{5}+\frac{6}{11}+\frac{3}{4}+\frac{6}{25}+\frac{9}{25}\)

\(=\frac{5}{11}+\frac{6}{11}+\frac{1}{4}+\frac{3}{4}+\frac{2}{5}+\frac{6}{25}+\frac{9}{25}\)

\(=1+1+1\)

\(=3\)

\(\frac{79}{28}\)nha bạn

1x2x3x4x5x6x7x8x9

2x3x4x5x6x7x8x9x10

=1/10

b)1/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9*9/10

=1x2x3x4x5x6x7x8x9

  2x3x4x5x6x7x8x9x10

= 1

  10

\(\text{Cx khá đơn giản nhưng a giải chi tiết luôn nha}\)

\(1.\)

\(5\left(x+4\right)=25x\)

\(\Leftrightarrow5x+20=25x\)

\(\Leftrightarrow5x-25x=-20\)\(\text{(chuyển vế)}\)

\(\Leftrightarrow-20x=-20\)

\(\Leftrightarrow x=1\)

\(2.\)

\(-\frac{3}{6}=\frac{25}{2x-1}\)

\(\Leftrightarrow-\frac{1}{2}=25.\frac{1}{2x-1}\)

\(\Leftrightarrow\frac{1}{2x-1}=-\frac{1}{2}:25=-\frac{1}{50}\)

\(3.\)\(\text{(tương tự)}\)

\(\Leftrightarrow-50=2x-1\)\(\text{(nhân chéo)}\)

\(\Leftrightarrow x=-50+1=-49\)

\(4.\)

\(5\left(x-4\right)=3x+8\)

\(\Leftrightarrow5x-20=3x+8\)

\(\Leftrightarrow5x-3x=20+8\)

\(\Leftrightarrow2x=28\)

\(\Leftrightarrow x=28:2=14\)

1) 5.(x+4)=25x

5x+20=25x

20=25x-5x

20=20x

x=1

2) \(\frac{-3}{6}=\frac{25}{2x-1}\)

-3.(2x-1)=6.25                

-6x+3=150

-6x=147

x=-24,5

câu 3,4 lm tương tự nha Nhớ đấy!!!!

1: \(=\dfrac{272-168+186}{30}\cdot\dfrac{7}{9}=\dfrac{29}{3}\cdot\dfrac{7}{9}=\dfrac{203}{27}\)

2: \(=\dfrac{9-55}{33}\cdot\dfrac{6-5}{8}-\dfrac{4}{5}\cdot\dfrac{1}{24}=\dfrac{-4}{3}\cdot\dfrac{1}{8}-\dfrac{1}{30}=\dfrac{-1}{6}-\dfrac{1}{30}=\dfrac{-6}{30}=-\dfrac{1}{5}\)

3: \(=\dfrac{7}{3}\left(\dfrac{6}{25}+\dfrac{19}{25}\right)=\dfrac{7}{3}\cdot1=\dfrac{7}{3}\)

a.
(5/11 + 6/11 ) + ( 1/4 +3/4) + ( 6/25 + 9/25)
= 11/11 + 4/4 + 15/25
= 1 +1 + 3/5
= 2+3/5 = 13/5
b.
( 37/100 + 163/100) + (1/8 + 3/8 ) + 19/4 + 1/2
=  200/100 + 4/8 + ( 19/4 + 2/4)
=    2 + 1/2 + 21/4
=  31/4

1/3 + 7/5 = 26/15

3/15 + 2/5 = 3/5

4/6 + 18/27 = 4/3

15/25 + 6/21 = 31/35

k nhé:))

\(\frac{1}{3}\)+\(\frac{7}{5}\)=\(\frac{5}{15}\)+\(\frac{21}{15}\)=\(\frac{26}{15}\)

\(\frac{3}{15}\)+\(\frac{2}{5}\)=\(\frac{1}{5}\)+\(\frac{2}{5}\)=\(\frac{3}{5}\)

\(\frac{4}{6}\)+\(\frac{18}{27}\)=\(\frac{2}{3}\)+\(\frac{2}{3}\)=\(\frac{4}{3}\)

\(\frac{15}{25}\)+\(\frac{6}{21}\)=\(\frac{3}{5}\)+\(\frac{2}{7}\)=\(\frac{21}{35}\)+\(\frac{10}{35}\)=\(\frac{31}{35}\)

đây nha