Математика 6 класс

Упражнение 1060

Условие:

Решите уравнение:
а) 2/3х + 4/9х = 3,2;
б) 5/12х - 4/15х = 0,51;
в) х - 0,2х = 8/15.

 

Ответ:

а) 2/3х + 4/9х = 3,2 => (2/3 + 4/9)x = 3,2 => (6/9 + 4/9)х = 3,2 => х = 3,2 : 10/9 = 2,88;
б) 5/12х - 4/15х = 0,51 => (5/12 - 4/15)х = 0,51 => (25/60 - 16/60)х = 0,51 => х = 0,51 : 9/60 = 3,4;
в) х - 0,2х = 8/15 => (1 - 0,2)х = 8/15 => 0,8х = 8/15 => х = 8/15 : 8/10 = 2/3.

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