Вычислите: 1) 1 5/12 * 3/34 + 1 5/12 * 1 31/34; 2) 10 2/3 * 2 2/5 - 2 2/5 * 5 1/2.

Question

Вычислите: 1) 1 5/12 * 3/34 + 1 5/12 * 1 31/34; 2) 10 2/3 * 2 2/5 - 2 2/5 * 5 1/2.

Answer 1

1) 1 5/12 * 3/34 + 1 5/12 * 1 31/34= 1 5/12*(3/34 + 1 31/34)= 1 5/12 * 2 = 17/12 * 2= 17/6 = 2 5/6;

2) 10 2/3 * 2 2/5 - 2 2/5 * 5 1/2 = 2 2/5*(10 2/3 - 5 1/2) = 2 2/5 *(10 4/6 - 5 3/6)=2 2/5 * 5 1/6 = 12/5 * 31/6 = 62/5 = 12 2/5