Вычислите: 1) -14/15 × 25/28 + (-36/37) ÷ (-6/37) ; 2) 26/27 × (-9/65) + (-100/101) ÷ 50/303 ; 3)-30/31 × 15/124 + (-16/21) × (-7/8) ; 4) (-51/58) ÷ (-17/25) - 25/27 × (-81/125)

Первый пример.

-14/15 * 25/28 + (-36/37) ÷ (-6/37) = 5 1/6

1) -14/15 * 25/28 = -5/6

2) -36/37 ÷ (-6/37) = -36/37 * (-37/6) = 6

3) -5/6 + 6 = 5 1/6

Второй пример.

26/27 * (-9/65) + (-100/101) ÷ 50/303 = -6 2/15

1) 26/27 * (-9/65) = -2/15

2) -100/101 ÷ 50/303 = -100/101 * 303/50 = -6

3) -2/15 - 6 = -6 2/15

Третий пример.

-30/31 * 15/124 + (-16/21) * (-7/8) = 3169/5766

1) -30/31 * 15/124 = -225/1922

2) -16/21 * (-7/8) = 2/3

3) -225/1922 + 2/3 = -675/5766 + 3844/5766 = 3169/5766

Четвертый пример.

(-51/58) ÷ (-17/25) - 25/27 * (-81/125) = 1 259/290

1) -51/58 ÷ (-17/25) = -51/58 * (-25/17) = 75/58 = 1 17/58

2) 25/27 * (-81/125) = -3/5

3) 75/58 + 3/5 = 375/290 + 174/290 = 549/290 = 1 259/290