72^3*54^2=1088391168

108^4=136048896

bạn chấm điểm cho mik với nhé ;)))

câu b 

3^10.11+3^10x5  = 3^10.16  = 3.3.3^8.2.8   =3^8.2

   39.24                      39.24       3.13.3.8         13

mik ghi xuống dòng như vậy là giống phân số á bn, lm đúng ko thì ko chắc :)))

`@` `\text {Ans}`

`\downarrow`

\(14 - x + ( - 10) = - ( - 9) + ( + 15)\)

`\Rightarrow (14 - 10) - x = 9 + 15`

`\Rightarrow 4 - x = 24`

`\Rightarrow x = 4 - 24`

`\Rightarrow x = -20`

Vậy, `x = -20.`

\(14-x+\left(-10\right)=-\left(-9\right)+\left(+15\right)\)

\(\Rightarrow14-x-10=9+15\)

\(\Rightarrow4-x=24\)

\(\Rightarrow x=4-24\)

\(\Rightarrow x=-20\)

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

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

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

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

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

\(=100:5\)

\(=20\)

$100:\left\{250:\left[450-\left(4\cdot 5^3-2^2\cdot 25\right)\right]\right\}$

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

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

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

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

$=100:5$

$=20$

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 

\(a^2+16\cdot a\)

\(=a\cdot\left(a-16\right)\)

Bạn xem lại đề

\(D=1-4+4^2-4^3+4^4-...+4^{2016}-4^{2017}\) (sửa \(2^{2017}\) thành \(4^{2017}\))

\(\Rightarrow D=\left(1-4\right)+4^2\left(1-4\right)+4^4\left(1-4\right)-...+4^{2016}\left(1-4\right)\)

\(\Rightarrow D=\left(-3\right)+4^2.\left(-3\right)+4^4.\left(-3\right)-...+4^{2016}.\left(-3\right)\)

\(\Rightarrow D=\left(-3\right)\left(1+4^2+4^4+...+4^{2016}\right)\)

\(\Rightarrow4D=\left(-3\right)\left(4+4^3+4^5+...+4^{2017}\right)\)

\(\Rightarrow4D+D=\left(-3\right)\left(1+4+4^2+4^3+4^4+...+4^{2016}+4^{2017}\right)\)

\(\Rightarrow5D=\left(-3\right)\dfrac{4^{2017+1}-1}{4-1}\)

\(\Rightarrow D=\left(-3\right)\dfrac{4^{2018}-1}{3.5}\)

\(\Rightarrow D=\left(-1\right)\dfrac{4^{2018}-1}{5}=\dfrac{1-4^{2018}}{5}\)

TỔng tiền mua bánh kẹo:

22000 + 30000= 52000 (đồng)

Lan còn lại:

300000 - 52000= 248000 (đồng)

Đáp số: 248 000 đồng

4 ⋮ (2x + 1)

⇒ 2x + 1 ∈ Ư(4) = {-4; -2; -1; 1; 2; 4}

⇒ 2x ∈ {-5; -3; -2; 0; 1; 3}

⇒ x ∈ {-5/2; -3/2; -1/2; 0; 1/2; 3/2}

x¹⁰ = x

x¹⁰ - x = 0

x(x⁹ - 1) = 0

x = 0 hoặc x⁹ - 1 = 0

*) x⁹ - 1 = 0

x⁹ = 1

x = 1

Vậy x = 0; x = 1

\(x^{10}=x\)

\(\Rightarrow x=1\)