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5( x+7) -10 = 2³ . 5

=> 5x + 35 - 10 = 8 .5

=> 5x + 25 = 40

=> 5x = 40 - 25 =15

=> x = 15 : 5 = 3

Vậy x = 3

\(5.\left(x+7\right)-10=2^3.5\)

\(5.\left(x+7\right)-10=8.5=40\)

\(5.\left(x+7\right)=40+10=50\)

\(x+7=50:5=10\)

\(x=10-7=3\)

1

negative:i don't have lunch at 11 o'clock

question:when do you have lunch?

2

negative:Tony isn't my best friend

question:What is your best friend?

1.

         (-) : I don't have lunch at 11 o'clock.

         (?) : Do you have lunch at 11 o'clock?

2.

        (-) : Tony isn't my best friend.

        (?) : Is Tony your best friend?

\(3.2+\left(x+5^2\right)=10^2\)

\(6+\left(x+25\right)=100\)

\(x+25=100-6=94\)

\(x=94-25=69\)

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`@` `\text{Ans}`

`\downarrow`

`2^(2x-4)=64`

`=>2^(2x-4)=2^6`

`=>2x-4=6`

`=>2x=10`

`=>x=10 \div 2`

`=> x=5`

Vậy, `x = 5.`

`@` `\text{Ans}`

`\downarrow`

`2^(2x-3)=32`

`=> 2^(2x-3)=2^5`

`=>2x -3=5`

`=> 2x=8`

`=>x=4` 

Vậy, `x=4.`

\(100:\left\{250:\left[450-\left(4\cdot5^3-2^2\cdot25\right)\right]\right\}\)

\(=100:\left\{250:\left[450-\left(4\cdot125-4\cdot25\right)\right]\right\}\)

\(=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}\)

\(=100:\left[250:\left(450-400\right)\right]\)

\(=100:\left(250:50\right)\)

\(=100:5\)

\(=20\)

100:{250:[450−(4⋅53−22⋅25)]}

$=100:\left\{250:\left[450-\left(4\cdot 125-4\cdot 25\right)\right]\right\}$

$=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}$

$=100:\left[250:\left(450-400\right)\right]$

$=100:\left(250:50\right)$

$=100:5$

$=20$

98-[130-(12-4)²]

= 98-[130-8²]

=98-[130-64]

=98-66

=32

2⁷ : 2² = 2⁵ = 32

5⁴ : 5³ = 5 

2⁴ - 3.2⁵ = 16 - 96 = - 80 

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