a/16

b/15

tui tick cậu rùi c5u tick tui nha

a) 16   

b)15

Nguyễn Hương Giang tự hỏi tự trả lời!!!

10

10

15 nhá bạn

11+11=(1+1).(1+1)=4

12+13=(1+2).(1+3)=3.4=12

21+14=(1+2)(1+4)=3.5=15

12 gấp 3 lần 4 .

số gấp 3 lần 12 là 36 .

=15

ta có quy luật sau

11 + 11 =4

=> 2 x 2 =4

12 + 13 = 12

3 x 4 = 12

=> 21 + 14 = 3 x 5 = 15

cái này trên chinh phục vũ môn đấy 

Ta có: 11 + 11 = (1+1) .  (1+1) = 2 . 2  = 4

12 + 13 = (1+2) . (1+3) = 3 . 4 = 12

=> 21 + 14 = (2+1) . (1+4) = 3 . 5 = 15

ta co 1+1=2

=>11+11=2*2=4

1+2=3

1+3=4

=>12+13=3*4

2+1=3

1+4=5

=>21+14=3*5=15

Ta có quy luật sau : 

       11 + 11 = 4

   => 2 x 2  = 4

      12 + 13  = 12

  => 3 x 4     = 12

Do đó : 21 x 14 = 3 x 5 = 15

a, = \(\frac{11}{21}\)x \(\left(\frac{7}{4}+\frac{5}{4}\right)\)

   = \(\frac{11}{21}\)x 3

  = \(\frac{33}{21}\)

b) = \(\left(\frac{23}{14}-\frac{9}{14}\right)\)x \(\frac{6}{13}\)

    = 1 x \(\frac{6}{13}\)

    = \(\frac{6}{13}\)

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Giúpppp mìnhh vớiiiiiiiiiiiiiiiiiiiiiiiii nhanhhhhhhhhhhh lênnnnnnnnnnnnnnnnn

Nhanh rồi mình tích cho

a: \(\dfrac{6}{7}\cdot\dfrac{16}{15}\cdot\dfrac{7}{6}\cdot\dfrac{21}{32}=\dfrac{16}{32}\cdot\dfrac{21}{15}=\dfrac{1}{2}\cdot\dfrac{7}{5}=\dfrac{7}{10}\)

b: \(\dfrac{21}{17}\cdot\dfrac{13}{14}\cdot56\cdot\dfrac{3}{42}=\dfrac{21}{14}\cdot\dfrac{13}{17}\cdot\dfrac{1}{14}\cdot56=\dfrac{78}{17}\)

c: \(=\dfrac{11}{21}\left(\dfrac{7}{4}+\dfrac{5}{4}\right)=\dfrac{11}{21}\cdot3=\dfrac{11}{7}\)

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