Question

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Answer 1

Решение во вложении -------------

Answer 2

1.1-2/7= 7/7-2/7= 5/7
2. 1+2/7= 1 2/7
3. 1: 2/7= 1*7/2= 3 1/2
4. 3/4 *(-4/3)= - 1
5. - 2/5+2 = -2/5 +1 5/5= 1 3/5
6. - 2/5 - 2= -2/5 - 1 5/5= - 1 7/5 = - 2 2/5
7. 3 1/2 *2 = 7/2* 2= 7
8. 3 1/2 :2 = 7/2 * 1/2 = 7/4 = 1 3/4
9. - 4 + 2 1/2= - 3 2/2 + 2 1/2= -1 1/2
10.- 4 - 2 1/2 = - 3 2/2 - 2 1/2 = - 5 3/2 = - 6 1/2