683 x 35 = 23905

1954 x 425 = 830450

2438 x 306 = 746028

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

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

Hướng dẫn giải: 

\(27^{13}=\left(3^3\right)^{13}=3^{39};243^8=\left(3^5\right)^8=3^{40};3^{39}< 3^{40}\Rightarrow27^{13}< 243^8\\ 125^{80}=\left(5^3\right)^{80}=5^{240};25^{118}=\left(5^2\right)^{118}=5^{236};5^{240}>5^{236}\Rightarrow125^{80}>25^{118}\)

\(27^{13}< 243^8;125^{80}>25^{118}\)

\(125^{80}=\left(5^3\right)^{80}=5^{240}\\ 25^{118}=\left(5^2\right)^{118}=5^{236}\)

Vì \(5^{240}>5^{236}\)nên \(125^{80}>25^{118}\)

683 x 35 = 23905

1954 x 425 = 830450

2438 x 425 = 1036150

KB VS NHA!

683 . 35 = 23905

1954 . 425 = 68404875

2438 . 425 = 1036150

683 x 35 = 23905

1954 x 425  =830450

2438 x 425 = 1036150

hok tốt , là bạn bè r 

a. 102 x 7 = 714

b. 306 : 6 = 51

TK:

123255

106488

388

578.026086.........