Question

Решите пропорции

A 4

— = —

54 19



1,4:Х=7:20

Срочно очень нужно!!!!!!!

Answer 1

$frac{a}{54} = frac{4}{19} \ a = frac{4 times 54}{19} \ a = frac{216}{19} = 11 frac{7}{19}$
если тут не 54, а 57, то
$a = frac{4 times 57}{19} \ a = 4 times 3 = 12$
.
1,4:х=7:20
х=1,4*20:7
х=4

Answer 2

$frac{a}{54} = frac{4}{19} \ \ 19a = 216 \ \ a = frac{216}{19} = 11 frac{7}{19} \ - - - - - - - \ 1.4 div x = 7 div 20 \ 1. times 20 = 7x \ 28 = 7x \ 7x = 28 \ x = 4$