Lời giải:

$7^{5x}:49=7^{28}$

$7^{5x}:7^2=7^{28}$

$7^{5x-2}=7^{28}$

$\Rightarrow 5x-2=28$

$\Rightarrow 5x=30$
$\Rightarrow x=6$

b.
$5^{2x}.5^{14}=5^{30}$

$5^{2x+14}=5^{30}$

$\Rightarrow 2x+14=30$

$\Rightarrow 2x=16$

$\Rightarrow x=8$

a) 7^5x:49=7^28

    7^5x:7^2=7^28

     7^5x=7^28.7^2

      7^5x=7^30

suy ra 5x=30

             x= 6

b) 5 mũ 2x. 5 mũ 14 =5 mũ 30

5^2x=5^16

suy ra 2x=16

x =16/2

x=8

\(\dfrac{49}{28}:\dfrac{5}{4}.\dfrac{6}{7}=\dfrac{49}{28}.\dfrac{4}{5}.\dfrac{6}{7}=\dfrac{49.4.6}{28.5.7}=\dfrac{7.7.4.6}{4.7.5.7}=\dfrac{6}{5}\)

\(\dfrac{49}{28}:\dfrac{5}{4}\times\dfrac{6}{7}\)

= \(\dfrac{49}{28}\times\dfrac{4}{5}\times\dfrac{6}{7}\)

= \(\dfrac{7\times7}{4\times7}\) x \(\dfrac{4}{5}\) x \(\dfrac{6}{7}\)

= \(\dfrac{6}{5}\)

Lời giải chi tiết:

8+1=9

7-5=2

5+2=7

10-6=4

28+1=29

57-5=52

7-35=-28

52+0=52

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7 x 3 = 21 6 x 4 = 24 5 x 6 = 30 6 x 7 = 42

49  : 7 =  7       36 : 6 = 6        28 : 7 = 4         48 : 6 = 8

-9/28

a) 7 x 5 = 35       7 x 6 = 42       7 x 8 = 56       7 x 4 = 28

    35 : 7 = 5       42 : 7 = 6       56 : 7 = 8       28 : 7 = 4

b) 42 : 7 = 6       35 : 7 = 5       63 : 7 = 9       16 : 2 = 8

    14 : 7 = 2       49 : 7 = 7       7 : 7 = 1       48 : 6 = 8

    28 : 7 = 4       70 : =10       21 : 7 = 3       56 : 7 = 8

 7 X 5 = 35