Verified answer

(5/21 + 3/14) · 1 2/19 = 1/2

1) 5/21 + 3/14 = 10/42 + 9/42 = 19/42

2) 19/42 · 1 2/19 = 19/42 · 21/19 = 21/42 = 1/2

Вiдповiдь: 1/2 (или 0,5 в десятичных дробях).