1编号:6695题型:单选题测试正确率:75.95%

2编号:6694题型:单选题测试正确率:63.16%

3编号:6693题型:单选题测试正确率:45.98%

4编号:6692题型:单选题测试正确率:88.05%

5编号:6691题型:单选题测试正确率:80.3%

6编号:6690题型:单选题测试正确率:47.08%

7编号:6689题型:单选题测试正确率:82.97%

8编号:6688题型:单选题测试正确率:90.72%

9编号:6687题型:单选题测试正确率:87.39%

10编号:6671题型:单选题测试正确率:32.08%

计算(-a) (-b)4(-b)7的结果为()