Question

1целая 8/21 - 1целая 19/20

Answer 1

Ответ:-239/399

Пошаговое объяснение:

1целая 8/21 - 1целая 19/20=8/21-19/20=(8×20-19×21)/21×20=-239/399

Answer 2

To subtract the fractions 1 8/21 and 1 19/20, we need to find a common denominator.

The least common multiple (LCM) of 21 and 20 is 420. So we can rewrite the fractions with this common denominator:

1 8/21 = (1 * 20/20) + 8/21 = 20/20 + 8/21 = 400/420 + 8/21 = 400/420 + (8 * 20/20) / 21 = 400/420 + 160/420 = 560/420

1 19/20 = (1 * 21/21) + 19/20 = 21/21 + 19/20 = 420/420 + 19/20 = 420/420 + (19 * 21/21) / 20 = 420/420 + 399/20 = 819/420

Now, we can subtract the fractions:

560/420 - 819/420 = (560 - 819) / 420 = -259/420

Therefore, 1 8/21 - 1 19/20 is equal to -259/420.