562 HT

😒😒😒

2/3 + 7/1 = 2/3 + 7 = 2/3 + 21/3 = 23/3

25/48 + 11/24 = 25/48 + 22/48 = 47/48

5/7 + 3/8 = 40/56 + 21/56 = 61/56

15/24 + 12/6 = 5/8 + 2 = 5/8 + 16/8 = 21/8

5/6 + 4/3 = 5/6 + 8/6 = 13/6

3/8 + 7/12 = 9/24 + 14/24 = 23/24

= 23/3

= 47/48

=61/56

=21/8

=13/6

= 23/24

\(\frac{4}{3}\times\frac{9}{8}\times...\times\frac{81}{80}=\frac{2^2}{1\times3}\times\frac{3^2}{2\times4}\times...\times\frac{9^2}{8\times10}\)

\(=\frac{2\times3\times4\times...\times9}{1\times2\times3\times...\times8}\times\frac{2\times3\times4\times...\times9}{3\times4\times5\times...\times10}\\ =\frac{9}{1}\times\frac{2}{10}=\frac{9}{5}\)

4/3.9/8.16/15.25/24.36/35.49/48.64/63.81/80

=3/2.16/15.25/24.36/35.49/48.64/63.81/80

=5/3.36/35.49/48.64/63.81/80

=7/4.64/63.81/80

=9/5

+

48 x 45 = 24 x 2 x 5 x 9 = 24 x 9 x 10 = 216 x 10 = 2160

2160 tick nha

a) 25/48 + 11/24 = 25/48 + 22/48 = 47/48

b) 5/7 + 3/18 = 5/7 + 1/6 = 30/42 + 7/42 = 37/42

c) 15/24 + 12/16 = 5/8 + 6/8 = 11/8

d) 5/8 + 3/5 = 25/40 + 24/40 = 49/40

e) 4/7 + 3/5 = 20/35 + 21/35 = 41/35

Chúc bạn học tốt.

😁😁😁

124 : x + 24 : x - 48: x = 25

( 124 + 24 - 48 ) : x = 25

100 : x = 25

x = 4

\(124\div x+24\div x-48\div x=25\)

\(\Leftrightarrow\left(124+24-48\right)\div x=25\)

\(\Leftrightarrow100\div x=25\)

\(\Leftrightarrow x=100\div25=4\)

124 : x + 24 : x - 48 : x = 25

(124 + 24 - 48) : x = 25

100 : x = 25

x = 100 : 25 

x = 4

124 : x cộng 24 :x trừ 48 :xbằng 25

TL : 

1)  112 x 5 x 2 

= 112 x 10

=1120

2) 2 x 247 x 5 

= 247 x 10 

= 2470

3) 2 x 4 x 3 x 5

= 12 x 10 

= 120

4) 20 x 7 x 5 x 8

= 100 x 56

= 5600

5) 25 x 35 x 4 

= 100 x 35 

= 3500

6) 47 x 7 + 47 x 3

= 47 x ( 7 + 3 ) 

= 47 x 10 

= 470

7) 5 x 7 x 9 x 2

= 10 x 63

= 630

8) 125 x 9 x 7 x 8 

= 1000 x 63

= 63000

9) 4 x 97 x 25

= 100 x 97

= 9700

10) 8 x 9 x 10 ( chắc thế )

= 80 x 9 

= 720

11) 240 x 24 + 240 x 24

= 24 x ( 240 + 240 )

= 24 x 480

= 11520

12) 27 x 2 + 27 x 3 + 27 x 5 

= 27 x ( 2 + 3 + 5 )

= 27 x 10

= 270

13) 48 x 4 + 48 x 3 + 48 x 2 + 48

= 48 x 4 + 48 x 3 + 48 x 2 + 48 x 1 

= 48 x ( 4 + 3 + 2 + 1 )

= 48 x 10 

= 480

14) 247 x 36 + 247 x 64

= 247 x ( 36 + 64 )

= 247 x 100 

= 24700

15) 76 x 6 + 76 x 4

= 76 x ( 6 + 4 ) 

= 76 x 10

= 760

16) 249 x 101 - 249

= 249 x 101 - 249 x 1

= 249 x ( 101 - 1 )

= 249 x 100

= 24900

Mong các ban cho tui 10 cái T I C K 

~HT~

hình như bn chưa ghi hết đề thì fải