Question

a, 2014¹⁵.(2.x - 60) =2014¹⁶

b, x+18÷3²=5.4²

C,7.(42 - x)=5³+134

Giúp tớ nhanh vs ạ

Answer 1

`#3107.101107`

a,

$2014^{15} . (2x - 60) = 2014^{16}$

$\Rightarrow 2x - 60 = 2014^{16} \div 2014^{15}$

$\Rightarrow 2x - 60 = 2014$

$\Rightarrow 2x = 2074$

$\Rightarrow x = 1037$

Vậy, `x = 1037`

b,

`x + 18 \div 3^2 = 5.4^2`

`\Rightarrow x + 18 \div 9 = 5.16`

`\Rightarrow x + 9 = 80`

`\Rightarrow x = 80 - 9`

`\Rightarrow x = 71`

Vậy, `x = 71`

c,

`7.(42 - x) = 5^3 + 134`

`\Rightarrow 7.(42 - x) = 125 + 134`

`\Rightarrow 7(42 - x) = 259`

`\Rightarrow 42 - x = 259 \div 7`

`\Rightarrow 42 - x = 37`

`\Rightarrow x = 42 - 37`

`\Rightarrow x = 5`

Vậy, `x = 5.`