Гаяна , ответ добавлен 09.12.2017 в 21:59

33*(31/3x-11/4x)=19
33*(124/12x-33/12x)=19
33/1*91/12x=19
1001/4x=19
25,25/x=19
25,25:x=19

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[email protected] , ответ добавлен 09.12.2017 в 21:53

1 способ.
33 * (3 1/3х - 1 1/4х) = 19
33 * (10/3х - 5/4х) = 19
33 * (40/12х - 15/12х) = 19
33 * 25/12х = 19
825/12х = 19
х = 19 : 825/12
х = 19 * 12/825
х = 228/825
х = 76/275

2 способ.
33 * (3 1/3х - 1 1/4х) = 19
33 * (10/3х - 5/4х) = 19
33 * (40/12х - 15/12х) = 19
40/12х - 15/12х = 19 : 33
25/12х = 19/33
х = 19/33 : 25/12
х = 19/33 * 12/25
х = (19*4)/(11*25)
х = 76/275

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