Question

2. Розв'яжіть рiвняння:
1) 1/3х+1/4х-1/5х=1 19/75
2) 3 2/3:(х-2 4/15)=3 5/13​

Answer 1

Ответ:

Пошаговое объяснение:

1) 1/3х+1/4х-1/5х=1 19/75; => НОК(3;4;5) = 60 =>

20/60x + 15/60x-12/60x = 94/75;

23/60x = 94/75;

x=94/75 : 23/60;

x=94/75 * 60/23;

x=(94*60) /(75*23);

x=5640/1725;

x = 3 31/115.

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2) (3 2/3):(x-2 4/15)=3 5/13​;

x-2 4/15 = 3 2/3 : 3 5/13;

x-2 4/15 = 11/3 : 44/13;

x-2 4/15 = 11/3 * 13/44;

x-2 4/15 = 13/12;

x=1 1/12 + 2 4/15;  => НОК(12;15) = 60 =>

x=1 5/60 + 2 16/60;

x= 3 21/60

x = 3 7/20.