`a,2/5 + 3/4`

`= 8/20 + 15/20`

`= 23/20`

`b,2/7 + 5/9`

`= 18/63 + 35/63`

`= 53/63`

`c, 4/7 + 3/4 + 2/7`

`= ( 4/7 + 2/7)+3/4`

`= 6/7 + 3/4`

`= 24/28 + 21/28`

`= 45/28`

`@ yl`

\(\dfrac{2}{5}+\dfrac{3}{4}=\dfrac{8}{20}+\dfrac{15}{20}=\dfrac{23}{20}\)

\(\dfrac{2}{7}+\dfrac{5}{9}=\dfrac{18}{63}+\dfrac{35}{63}=\dfrac{53}{63}\)

\(\dfrac{4}{7}+\dfrac{3}{4}+\dfrac{2}{7}= \left(\dfrac{4}{7}+\dfrac{2}{7}\right)+\dfrac{3}{4}=\dfrac{6}{7}+\dfrac{3}{4}=\dfrac{45}{28}\)

a)x*4/5:2=6/7               b)6/5:x:5/4=10/15

x*4/5=6/7 x 2                6/5:x=10/15 x 5/4

x*4/5=12/7                     6/5:x=5/6

x=12/7:4/5                       x=6/5:5/6

x=15/7                            x=36/25

a) x * 4/5 : 2 = 6/7

x * 4/5 = 6/7 *2

x *4/5        = 12/7

x                = 12/7 : 4/5

x               = 15/7

    Vậy x = 15/7

b) 6/5 : x : 5/4 = 10/15

6/5 : x              = 10/15 * 5/4

6/5 :x               =5/6

        x              = 6/5  : 5/6

        x               = 36/25

         Vậy x = 36/25

mn ơi e vít nhầm là tính rồi rút gọn mn sửa lại là rút gọn rùi tính

a: =2/5+3/5=1

b: =1/3+5/6=2/6+5/6=7/6

c: =7/8+5/8=12/8=3/2

d: =2/3+2/10

=20/30+6/30

=26/30=13/15

e: =1/2+1/3

=3/6+2/6

=5/6

f: =2/7+1/6

=12/42+7/42

=19/42

=\(\dfrac{27}{5}\)

\(\dfrac{12}{5}+3=\dfrac{12}{5}+\dfrac{15}{5}=\dfrac{12+15}{5}=\dfrac{27}{5}\)

12/5+3 = 12/5 + 15/5 = 27/5

2^29/(phần)2^28=2

Chi tiết hơn ạ

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\(\dfrac{-6}{25}+\left|\dfrac{-4}{5}\right|-\left|\dfrac{2}{25}\right|\)

\(=\dfrac{-6}{25}+\dfrac{4}{5}-\dfrac{2}{25}\)

\(=\dfrac{-6}{25}+\dfrac{20}{25}-\dfrac{2}{25}\)

\(=\dfrac{12}{25}\)

b) \(\dfrac{5}{9}-\left|\dfrac{4}{9}\right|+\left|\dfrac{8}{5}\right|\)

\(=\dfrac{5}{9}-\dfrac{4}{9}+\dfrac{8}{5}\)

\(=\dfrac{1}{9}+\dfrac{8}{5}\)

\(=\dfrac{5}{45}+\dfrac{72}{45}\)

\(=\dfrac{77}{45}\)

P = 1 +  ( 2² + 2³ ) + ( 2⁴ + 2⁵ ) + ( 2⁶ + 2⁷ )

P = 1 + 2 . ( 1 + 2 ) + 2 . ( 1 + 2 ) + 2 . ( 1 + 2 )

P = 1 + 2 . 3 + 2 . 3 + 2 . 3

Mỗi cặp đều có số 3 

=> P = 1 + 2² + 2³ + 2⁴ + 2⁵ + 2⁶ + 2⁷ chia hết cho 3

\(P=1+2^2+2^3+2^4+2^5+2^6+2^7\)

\(P=1+\left(2^2+2^3\right)+\left(2^4+2^5\right)+\left(2^6+2^7\right)\)

\(P=1+2^2\left(1+3\right)+2^4\left(1+2\right)+2^6\left(1+2\right)\)

\(P=1+2^2.3+2^4.3+2^6.3\)

\(P=\left(1+2^2+2^4+2^6\right).3⋮3\left(đpcm\right)\)

\(a,\dfrac{7}{12}+\dfrac{3}{4}\times\dfrac{2}{9}=\dfrac{7}{12}+\dfrac{1}{6}=\dfrac{7}{12}+\dfrac{2}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)

\(b,\dfrac{8}{9}-\dfrac{4}{15}:\dfrac{2}{5}=\dfrac{8}{9}-\dfrac{4}{15}\times\dfrac{5}{2}=\dfrac{8}{9}-\dfrac{2}{3}=\dfrac{8}{9}-\dfrac{6}{9}=\dfrac{2}{9}\)

đùa thì kệ con mẹ mày xàm loz

Đáp án a là 0,75 

Đáp án b: là 0.86222222222

a) \(\dfrac{4}{11}+\dfrac{5}{22}=\dfrac{8}{22}+\dfrac{5}{22}=\dfrac{13}{22}\)

b) \(3-\dfrac{3}{8}=\dfrac{3}{1}-\dfrac{3}{8}=\dfrac{24}{8}-\dfrac{3}{8}=\dfrac{21}{8}\)

c) \(\dfrac{9}{25}\times5=\dfrac{45}{25}=\dfrac{9}{5}\)

d) \(\dfrac{3}{7}\div4=\dfrac{3}{28}\)

a)

= 8/22 + 5/22

= 11/22

= 1/2

b)

= 24/8 - 3/8

= 21/8

c)

= 45/25

= 9/5

d)

= 3/7 x 1/4

= 3/28

:)