Question

$x div 2.5 = 8 frac{4}{7} div 2 frac{1}{7}$
$frac{10.5}{x - 3.6} = frac{51}{x + 1.8}$
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Answer 1

Ответ:

х:2.5=8 4/7:2 1/7

х:2.5=4

х=4*2.5

х=10

105/2(5х-18)=2555х+9

105(5х+9)=510(5х-18)

525х+945=2550х-9180

525х-2550х=-9180-945

-2025х=-10125

2025х=10125

х=10125:2025

х=5