Question

Помогите решить...
(4-2.5*35):3 13-13

16,821=X35

X:12=X36

Answer 1

$(4 - 2.5 times frac{3}{5} ) div 3 frac{1}{3} - frac{1}{3} = (4 - frac{25 times 3}{10 times 5} ) div frac{10}{3} - frac{1}{3} = 4 times frac{3}{10} - frac{3}{2} times frac{3}{10} - frac{1}{3} = frac{6}{5} - frac{9}{20} - frac{1}{3} = 1 frac{1}{5} - frac{9}{20} - frac{1}{3} = 1 frac{4 - 9}{20} - frac{1}{3} = 1 - frac{5}{20} - frac{1}{3} = 1 - frac{1}{4} - frac{1}{3} = frac{3}{4} - frac{1}{3} = frac{9 - 4}{12} = frac{5}{12}$
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$frac{16.8}{21} = frac{x}{35} \ 21x = 16.8 times 35 \ 21x = 588 \ x = 588 div 21 \ x = 28$
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$x div 12 = frac{x}{36} \ 36x = 12x : : : | div 12 \ x = 3x \ 3x - x = 0 \ 2x = 0 \ x = 0$