7 х-9/12=35/84 2 х+7/17 = 60/68

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19 августа, 17:54

7 х-9/12=35/84 2 х+7/17 = 60/68

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Иван Ширяев · Answer 1

1) 7x - 9/12 = 35/84;

7x = 35/84 + 9/12;

7x = 35/84 + (9 * 7) / (12 * 7);

7x = 35/84 + 63/84;

7x = (35 + 63) / 84;

7x = 98/84;

7x = 1 14/84;

7x = 1 14 / (6 * 14);

7x = 1 1/6;

x = 1 1/6 : 7;

x = (1 * 6 + 1) / 6 : 7;

x = (6 + 1) / 6 : 7;

x = 7/6 : 7;

x = 7/6 * 1/7;

x = (7 * 1) / (6 * 7);

x = 1/6.

Ответ: х = 1/6.

2) 2x + 7/17 = 60/68;

2x = 60/68 - 7/17;

2x = (4 * 15) / (4 * 17) - 7/17;

2x = 15/17 - 7/17;

2x = (15 - 7) / 17;

2x = 8/17;

x = 8/17 : 2;

x = 8/17 * 1/2;

x = (8 * 1) / (17 * 2);

x = (4 * 2) / (17 * 2);

x = 4/17.

Ответ: х = 4/17.