Giải:

a) \(2\dfrac{17}{20}-1\dfrac{15}{11}+6\dfrac{9}{20}:3\)

\(=\dfrac{57}{20}-\dfrac{26}{11}+\dfrac{129}{20}:3\) 

\(=\dfrac{107}{220}+\dfrac{43}{20}\)

\(=\dfrac{29}{11}\)

b) \(4\dfrac{3}{7}:\left(\dfrac{7}{5}.4\dfrac{3}{7}\right)\) 

\(=\dfrac{31}{7}:\left(\dfrac{7}{5}.\dfrac{31}{7}\right)\) 

\(=\dfrac{31}{7}:\dfrac{31}{5}\) 

\(=\dfrac{5}{7}\) 

c) \(\left(3\dfrac{2}{9}.\dfrac{15}{23}.1\dfrac{7}{29}\right):\dfrac{5}{23}\) 

\(=\left(\dfrac{29}{9}.\dfrac{15}{23}.\dfrac{36}{29}\right):\dfrac{5}{23}\) 

\(=\dfrac{60}{23}:\dfrac{5}{23}\) 

\(=12\)

a) 4 + ( 5x + 2 ) : 3 = 58

( 5x + 2 ) : 3 = 58 - 4

( 5x + 2 ) : 3 = 54

( 5x + 2 ) = 54 . 3

( 5x + 2 ) = 162

5x = 162 - 2

5x = 160

x = 160 : 5

x = 32

a) x = 32.

b) x = 5.

c) a = -1;0;1. Riêng câu này thì mình chứ chắc đứng nha bạn.

\(\left|5x-2\right|\le13\)

\(\Rightarrow-13\le5x-2\le13\)

\(\Rightarrow-11\le5x\le13\)

\(\Rightarrow\frac{-11}{5}\le x\le\frac{13}{5}\)

72 : ( x - 15 ) = 8

        x - 15   = 72 : 8

        x - 15   = 9

        x          = 9 + 15

        x          = 24

Vậy x = 24 .

Học tốt !

=> x-15 = 72:8 = 9

=> x = 9+ 15 = 24

https://hoc24.vn/cau-hoi/help-me-so-sanh-437-va-38-510825.488777179563

Ta có :

4^37=(2^2)^37=2^74

3^8+5^10+8^25>8^25= (2^3)^25=2^25

Vì 2^74<2^75

=> 4^37 < 3^8 + 5^10+8^25

Vậy 4^37 < 3^8 + 5^10+8^25

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