= 1 - 6/9:3/4 +12/24x4/7

= 1 - 2/9 x 4 + 2/7

=1-8/9+ 2/7

=25 / 63 

k cho mik nha ! Phan Thuỳ Linh #$%

7/9 - 3/7 + 2/3 - 4/7

= 7/9 + 2/3 - ( 4/7 + 3/7 )

= 13/9 - 1 

= 4/9

8,12 x 6 + 16,24 x 4 - 4,06 x 8

= 8,12 x 6 + 8,12 x 2 x 4 - 8,12 : 2 x 8

= 8,12 x 6 + 8,12 x 8 - 8,12 x 4 

= 8,12 x ( 6 + 8 - 4 )

= 8,12 x 10  

81,2 

Ủng hộ nhé ! Chúc bạn học giỏi !

          7/9 - 3/7 + 2/3 - 4/7

       = 7/9 + 2/3 - 3/7 - 4/7

       = 7/9 + 2/3 - [ 3/7 + 4/7 ]

       = 13/9 - 1

        = 4/9

           8,12 * 6 + 16,24 * 4 - 4,06 * 8

        = 8,12 * 6 + 8,12 * 2 * 4 - 4,06 * 2 * 4

        = 8,12 * 6 + 8,12 * 8 - 8,12 * 4

        = 8,12 * [ 6 + 8 - 4 ]

        = 8,12 * 10

        = 81,2

                   CHÚC CÁC BẠN THÀNH CÔNG . Nhớ k cho mình nhiều nhiều nhé !

7/9 - 3/7 + 2/3 - 4/7
= 7/9 + 2/3 - ( 4/7 + 3/7 )
= 13/9 - 1 
= 4/9
8,12 x 6 + 16,24 x 4 - 4,06 x 8
= 8,12 x 6 + 8,12 x 2 x 4 - 8,12 : 2 x 8
= 8,12 x 6 + 8,12 x 8 - 8,12 x 4 
= 8,12 x ( 6 + 8 - 4 )
= 8,12 x 10  
81,2 
Ủng hộ nhé ! Chúc bạn học giỏi !

\(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{4}{6}+\frac{9}{12}+\frac{16}{20}=\left(\frac{1}{3}+\frac{4}{6}\right)+\left(\frac{1}{4}+\frac{9}{12}\right)+\left(\frac{1}{5}+\frac{16}{20}\right)\)

\(=1+1+1=3\)

Ta có\(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{4}{6}+\frac{9}{12}+\frac{16}{20}=\left(\frac{1}{3}+\frac{4}{6}\right)+\left(\frac{1}{4}+\frac{9}{12}\right)+\left(\frac{1}{5}+\frac{16}{20}\right)\)

\(=\left(\frac{2+4}{6}\right)+\left(\frac{3+9}{12}\right)+\left(\frac{4+16}{20}\right)\)

\(=\frac{6}{6}+\frac{12}{12}+\frac{20}{20}\)

\(=1+1+1\)

\(=3\)

 \(=\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+...+\frac{1}{10}\)có 9 p/số

\(=\frac{1}{10}.9=\frac{9}{10}\)

= 1/10 + 1/10 + ...................... + 1/10 có 9 phân số

= 1/10 x 9

= 9/10

ai tk mình mình đang bị âm điểm

9 / 12 bn nha

tk mk nha các bn

thanks nhiêu

\(=\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}\)

\(=\frac{1}{10}.9\)

\(=\frac{9}{10}\)

Đúng 100%

Đúng 100%

Đúng 100%

\(\frac{1}{10}+\frac{2}{20}+\frac{3}{30}+\frac{4}{40}+\frac{5}{50}+\frac{6}{60}+\frac{7}{70}+\frac{8}{80}+\frac{9}{90}\)

\(=\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}\)

\(=\frac{1}{10}\times9\)

\(=\frac{9}{10}\)

x + 1= 1

x= 1- 1

x= 0 

= x=0

 k cho 

24×4/6×3/4

24×1/2

12/1

24 x \(\frac{4}{6}\)x \(\frac{3}{4}\) =  \(\frac{24}{1}\) x \(\frac{4}{6}\) x \(\frac{3}{4}\)

                              = \(\frac{24x4x3}{1x6x4}\)

                              = \(\frac{6x4x4x3}{1x6x4}\)

                              =  3

bạn anh sai rồi

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a \(\frac{4}{18}+\frac{5}{13}+\frac{7}{9}+\frac{21}{13}\)

= \(\left(\frac{4}{18}+\frac{7}{9}\right)+\left(\frac{5}{13}+\frac{21}{13}\right)\)

= \(1+2\)

= \(3\)

b \(\frac{4}{3}-\frac{2}{7}-\frac{5}{7}+\frac{2}{3}\)

= \(\left(\frac{4}{3}-\frac{2}{3}\right)-\left(\frac{2}{7}+\frac{5}{7}\right)\)

= \(\frac{2}{3}-1\)

= \(-\frac{1}{3}\)

Kết quả của bài 1/5+1/10+1/20+1/40+1/80+1/160 là gì