Question

Simplificati:
b)5³+5⁴+5⁵
- - -
5⁵+5⁶+5⁷


c)171717 supra 191919
Va rog repede este pentru un test​

Answer 1

b)5³+5⁴+5⁵+5⁶+5⁷=125+625+3125+15625+78125=97625

c)171717/191919=171717÷10101/191919÷10101=17/19

Answer 2

$\it \dfrac{5^3+5^4+5^5}{5^5+5^6+5^7}=\dfrac{5^3(1+5+25)}{5^5(1+5+25)}=\dfrac{\not5^3\cdot \not31}{\not5^3\cdot5^2\cdot \not31}=\dfrac{1}{5^2}=\dfrac{1}{25}$