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Автор - veronikamantulenko91

Решите пожалуйста с решением

Ответ

Автор - denisstretyakov

1) :  frac{x}{12}  =  frac{3}{4}  \ 4x = 12 times 3 \ 4x = 36 \ x =  frac{36}{4}   \ x = 9 \

2) :  frac{36}{2}  =  frac{x}{5}  \ 2x = 36 times 5 \ 2x = 180 \ x =  frac{180}{2}  \ x = 90

3) :  frac{18}{x}  = 5  div 2 \  frac{18}{x}  =  frac{5}{2}  \ 5x = 18 times 2\ 5 = 36 \ x =  frac{36}{5}  \ x = 7.2

4) :  x div 4 =  frac{9}{12}  \  frac{x}{4}  =  frac{9}{12}  \ 12x = 9 times 4 \ 12x = 36 \ x =  frac{36}{12}   \ x = 3

5) :  frac{x}{6}  =  frac{9}{27}  \ 27x = 9 times 6 \ 27x = 54 \ x =  frac{54}{27}  \ x = 2

6) :  frac{x}{5.5}  =  frac{100}{10}  \ 10x = 100 times 5.5 \ 10x = 550 \ x =  frac{550}{10}  \ x = 55

7) : 9.9 div x = 66 div 2 \  frac{99}{x}  =  frac{66}{2}  \ 66x = 99 times 2 \ 66x = 198 \ x =  frac{198}{66}  \ x = 3

8) :  frac{40}{2}  =  frac{x}{1.5}  \ 2x = 40 times 1.5 \ 2x = 60 \ x = frac{60}{2}  \ x = 30

9) :  frac{8.1}{0.9}  =  frac{3.6}{x}  \ 8.1x = 3.6 times 0.9 \ 8.1x = 3.24 \ x =  frac{3.24}{8.1}  \ x = 0.4

10) : 25 div 2 =  frac{x}{4}  \  frac{25}{2}  =  frac{x}{4}  \ 2x = 25 times 4 \ 2x = 100 \ x =  frac{100}{2}  \ x = 50

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