1编号:28899题型:填空题测试正确率:51.69%
-2tan45°=____.
2编号:1917题型:填空题测试正确率:79.73%
若,则=__________
3编号:1912题型:填空题测试正确率:80.68%
已知a<b,则化简二次根式的正确结果是_______.
提醒: