题目

Since we are social beings, the quality of our lives depends in large measure on our interpersonal(人与人之间的)relationships. One strength of the human condition is our possibility to give and receive support from one another under stressful conditions. Social support makes up of the exchange of resources among people based on their interpersonal ties. Those of us with strong support systems appear better able to deal with major life changes and daily problems. People with strong social ties live longer and have better health than those without such ties. Studies over types of illnesses（2010•鄂尔多斯）把3+[3a-2（a-1）]化简得    ．