a: \(2x+3x=5^7:5\)

=>\(5x=5^7:5=5^6\)

=>\(x=5^6:5=5^5\)

b: \(7\left(42-x\right)=5^3+134\)

=>7(42-x)=125+134=259

=>42-x=37

=>x=42-37=5

c: \(x+18:3^2=5\cdot4^2\)

=>\(x+\frac{18}{9}=5\cdot16\)

=>x+2=80

=>x=80-2

=>x=78

\(x-\left\{57-\left[42+\left(-23-x\right)\right]\right\}=13-\left\{47+\left[25-\left(32-x\right)\right]\right\}\)

=>\(x-\left\{57-42+23+x\right\}=13-47-25+32-x\)

=>\(x-\left(x+38\right)=-27-x\)

=>\(-27-x=-38\)

=>x+27=38

=>\(x=38-27=11\)

=2022x100=202200

= 2022 x ( 57 + 42 + 1 )

= 2022 x 100

= 202200

\(2022\times57+2022\times42+2022=2022\times\left(57+42+1\right)=2022\times\left(57+43\right)=2022\times100=202200.\)

\(x-\left\{57-\left[42+\left(-23-x\right)\right]\right\}=13-\left\{47+\left[25-\left(32-x\right)\right]\right\}\)

\(\Leftrightarrow x-57+42-23-x=13-47-25+32-x\)

\(\Leftrightarrow x-x-57+42-23=-27-x\)

\(\Leftrightarrow-57+42-23=-27-x\)

\(\Leftrightarrow-38=-27-x\)

\(\Leftrightarrow x=\left(-27\right)-\left(-38\right)\)

\(\Leftrightarrow x=11\)

Vậy \(x=11\) là giá trị cần tìm

\(x-\left(57-\left(42+\left(-23-x\right)\right)\right)=13-\left(47+\left(25-\left(32-x\right)\right)\right)\)

\(\Leftrightarrow\) \(x-\left(57-\left(42-23-x\right)\right)=13-\left(47+\left(25-32+x\right)\right)\)

\(\Leftrightarrow\) \(x-\left(57-42+23+x\right)=13-\left(47+25-32+x\right)\)

\(\Leftrightarrow\) \(x-57+42-23-x=13-47-25+32-x\)

\(\Leftrightarrow\) \(-38=-27-x\) \(\Leftrightarrow\) \(-x=-38+27=-11\Leftrightarrow x=11\)

vậy \(x=11\)

 x-(57-(42+(-23-x)=13-47+25-23-x

 x-57-42-23-x=13-47+25-23-x

 x-122-x=-32-x

 x-x-122=-32-x

 -32-x=-122

        x=-32-(-122)

        x=90

 Vậy x=90

\(x-(57-(42+(-23-x)=13-47+25-13-x\)

\(\Rightarrow x-57-42+\left(-23\right)-x=13-47+25-23-x\)

\(\Rightarrow x-x+x=13-47+25-23+23+42+57\)

\(\Rightarrow x=90\)

\(x-\left\{57-\left[42+\left(-23-x\right)\right]\right\}=13-\left\{47+\left[25-\left(32-x\right)\right]\right\}\)

\(\Leftrightarrow x-57+42-23-x=13-47-25+32-x\)

\(\Leftrightarrow x-x-57+42-23=-27-x\)

\(\Leftrightarrow-57+42-23=-27-x\)

\(\Leftrightarrow-38=-27-x\)

\(\Leftrightarrow x=-27-\left(-38\right)\)

\(\Leftrightarrow x=11\left(TM\right)\)

Vậy \(x=11\) là giá trị cần tìm

\(\Leftrightarrow\) \(x-\left(57-\left(42-23-x\right)\right)=13-\left(47+\left(25-32+x\right)\right)\)

\(\Leftrightarrow\) \(x-\left(57-42+23+x\right)=13-\left(47+25-32+x\right)\)

\(\Leftrightarrow\) \(x-57+42-23-x=13-47-25+32-x\)

\(\Leftrightarrow\) \(-38=-27-x\) \(\Leftrightarrow\) \(-x=-38+27=-11\Leftrightarrow x=11\)

vậy \(x=11\)

15 x 42 + 15 x 57 + 15

= 15 x ( 42 + 57 +1 )

= 15 x 100

= 1500

15 x 42 +15 x 57 + 15

=15(42 +57 +1)

=15 x 100 =1500

15 x 42 + 15 x 57 + 15

= 15 x ( 42 + 57 + 1 )

= 15 x 100

= 1500

=>x-57+42-23-x=13-47-25+32-x

=>x-x-57+42-23=-27-x

=>-57+42-23=-27-x

=>-38=-27-x

=>x=-27-(-38)

=>x=11

x-57+42-23-x=13-47-25+32-x

x=13-47-25+32+23-42+57

x=11

tick nha bạn