538 Вправа 538Алгебра 8 клас Бевз 2025 · § 11 · стор. 107

538. The inverse proportionality is given by the formula y = −10/x. Find: a) the value of the function if the argument is −1000; −100; 0,1; 0,02; 50; b) the value of the argument when the value of the function is −100; −40; 2; 100; 200.

a) ${\displaystyle y=}$${\displaystyle -\frac{10}{x}}$:

${\displaystyle -\frac{10}{-1000}=}$${\displaystyle 0,01}$;

${\displaystyle -\frac{10}{-100}=}$${\displaystyle 0,1}$;

${\displaystyle -\frac{10}{0,1}=}$${\displaystyle -100}$;

${\displaystyle -\frac{10}{0,02}=}$${\displaystyle -500}$;

${\displaystyle -\frac{10}{50}=}$${\displaystyle -0,2}$;

b) ${\displaystyle x=}$${\displaystyle -\frac{10}{y}}$:

${\displaystyle -\frac{10}{-100}=}$${\displaystyle 0,1}$;

${\displaystyle -\frac{10}{-40}=}$${\displaystyle 0,25}$;

${\displaystyle -\frac{10}{2}=}$${\displaystyle -5}$;

${\displaystyle -\frac{10}{100}=}$${\displaystyle -0,1}$;

${\displaystyle -\frac{10}{200}=}$${\displaystyle -0,05}$.