683 x 35 = 23905

1654 x 425 = 702950

2438 x 306 = 746028

7/9 x 3/35 = 1/15 ( rút gọn )

15,7 ; 6,28 = 2,5

11/17 : 33/34 = 2/3 ( rút gọn )

36,66 : 7,8 = 4,7 

15,7 : 6,28 = 2,5 ( lặp câu nè bạn )

27,63 : 0,45 = 61,4

683 x 35 = 23905

1654 x 425 = 702950

2438 x 306 = 746028

\(\frac{7}{9}\)x \(\frac{3}{35}\)= \(\frac{1}{15}\)

15,7 : 6,28 = 2,5

\(\frac{11}{17}\): \(\frac{33}{34}\)= \(\frac{2}{3}\)

36,66 : 7,8 = 4,7

15,7 : 6,28 = 2,5

27,63 : 0,45 = 61,4

1) =23905

2 =702950

3) =746028

4) =1/5

5) =5/2

6) =2/3

7) =47/10

8) =5/2

9) =307/5=61,4

6) =2/2

a) 683\(\times\) 35=23906

    1954\(\times\) 425=830450

    2438\(\times\) 306=746028

b) \(\dfrac{7}{9}\times\dfrac{3}{35}=\dfrac{7\times3}{9\times35}=\dfrac{1}{15}\) 

\(\dfrac{9}{22}\times55=\dfrac{9\times55}{22}=\dfrac{45}{2}\) 

\(\dfrac{11}{17}:\dfrac{33}{34}=\dfrac{11}{17}\times\dfrac{34}{33}=\dfrac{11\times34}{17\times33}=\dfrac{2}{3}\) 

c) 36,66:7,8=4,7

     15,7:6,28=2,5

      27,63:0,45=61,4

d) 16 giờ 15 phút:5=3 giờ 15 phút

    14 phút 36 giây:12=1 phút 13 giây

a) `683 xx 35 = 23905`

b) `1954 xx 425 = 830450`

c) `2438 xx 306 = 746028`

a) 683 x 35 = 23 905

b) 1954 x 425 = 830 450

c) 2438 x 306 = 746 028

a, 683 \(\times\) 35 =23905                                  

b, 1954 \(\times\) 425 =830450                           

c,2438 \(\times\) 306 =746028

\(\dfrac{7}{9}\cdot\dfrac{3}{35}=\dfrac{7}{3\cdot3}\cdot\dfrac{3}{7\cdot5}=\dfrac{1}{15}\)

\(\dfrac{9}{22}\cdot55=\dfrac{9}{11\cdot2}\cdot11\cdot5=\dfrac{45}{2}\)

\(\dfrac{11}{17}:\dfrac{33}{34}=\dfrac{11}{17}\cdot\dfrac{34}{33}=\dfrac{11\cdot17\cdot2}{17\cdot11\cdot3}=\dfrac{2}{3}\)

7/9 x 3/35 = 1/15

9/22 x 55 = 45/2

11/17 : 33/34 = 2/3

1/15     ;      45/2       ;      2/3

a: =35/17-18/17-9/5+4/5

=1-1=0

b: =-7/19(3/17+8/11-1)

=7/19*18/187=126/3553

c: =26/15-11/15-17/3-6/13

=1-6/13-17/3

=7/13-17/3=-200/39

a,8/3

b,1/5

c,17/135

d,2/3

e,5/2

a)\(\frac{8}{3}\)

b)\(\frac{1}{5}=0,2\)

c)\(\frac{17}{135}\)

d)\(\frac{2}{3}\)

e)\(\frac{5}{2}=2,5\)

a) 21/11 x 22/17 x 68/63

= (21 x 22 x 68)/ (11 x 17 x 63)

= 8/3

b) 5/14 x 7/13 x 26/25

= (5 x 7 x 26)/(14 x 13 x 25)

= (5 x 7 x 13 x 2) / ( 7 x 2 x 13 x 5 x 5)

= 1/5

c) 7/9 x 3/35 x 17/9

= (7 x 3 x 17)/ (9 x 35 x 9 )

= 17/135

d) 11/17 : 33/34

= 11/17 x 34/33

= (11 x 34)/(17 x 33)

= (11 x 17 x 2) / ( 17 x 33 x 11)

=2/33

e) 15,7 : 6,28

= 157/10 : 157/ 25

= 157/10 x 25/157

= (157 x 25) / ( 10 x 157)

= 25/10 = 5/2

k nha

683 x 35 = 23905

1954 x 425 = 830450

2438 x 306 = 746028

638 x 35 = 22330

1954 x 425 = 830450

2438 x 306 =746028

36,66 : 0, 45 = 4,7

15,7 : 6,28 =  2,5

còn lại đéo bt

De ma tai sao ban ko lam dc?

Đề bài yêu cầu gì vậy bạn?

a) = \(\frac{5\cdot7\cdot8\cdot9\cdot10}{7\cdot8\cdot9\cdot10\cdot11}\)

    = \(\frac{5}{11}\) gạch hết các chữ số 7 , 8 , 9 , 10.

b) = \(\frac{3\cdot145+3\cdot55}{6\cdot215+6\cdot85}\)

   = \(\frac{3\cdot\left(145+55\right)}{6\cdot\left(215+85\right)}\)

   = \(\frac{3\cdot200}{6\cdot300}\)

   = \(\frac{1}{3}\)

Mình hỏi bạn Nguyễn Gia Huy dấu chấm là gì

dấu . là x nhé 

dấu nhân.