1/2+(5 целых 1/6 -3 целых 1 /2 )×10/23 срочно

....................=1 31/138 1)   5 1/6 - 3 1/2=5 1/6 - 3 3/6=1 4/6=1 2/3 2)   1 2/3 * 10/23=5/3 * 10/23=50/69 3)  1/2 + 50/69=69/138 + 100/138=169/138=1 31/138