0,5- 1/2
0,2- 1/5
0,4 - 2/5
0,6 - 3/5
0,8 - 4/5
1)a-(b+c+d)-(c-f)=a-b-c-d-c+f=a-b-2c-d+f
2)a+(b+c)+(d-c-f)=a+b+c+d-c-f=a+b+d-f
3)a-(-b-c-d)+(-c+f)=a+b+c+d-c+f=a+b+d+f
4)a+(-b-c-d)-(c-f)=a-b-c-d-c+f=a-b-2c-d+f
5)a-(b-c)+(d-c+f)=a-b+c+d-c+f=a-b+d+f
6)a-(-b+c-d)+(c-f)=a+b-c+d+c-f=a+b+d-f
7)a+(b-c+d)-(-c+f)=a+b-c+d+c-f=a+b+d-f
8)a+(b+c)-d+(-c-f)=a+b+c-d-c-f=a+b-d-f
3/5 * 1/2 *4/9 =2/15
4/7 * 35/36 * 3/5=1/3