Question

0,4:x=6,65
2,5×x=5,65
Пжпж
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Answer 1

$0.4 \div x = 6.65 \\ \frac{2}{5} \times \frac{1}{x} = 6.65 \\ \frac{2}{5x} = 6.65 \\ \frac{2 }{5x} \times (5x) = 6.65 \times (5x) \\ 2 = 33.25 x \\ 33.25x = 2 \\ x = 2 \div 33.25 \\ x = \frac{8}{133}$

$2.5x = 5.65 \\ 2.5x \div 2.5 = 5.65 \div 2.5 \\ x = 5.65 \div 2.5 \\ x = 2.26$

Всё как ты хотел всё верно:)