【简答题】写出解方程x 2 -2x-3=0的一个算法.
【简答题】解方程:5(x+8)﹣5=6(2x﹣7).
【单选题】The human beings should preserve the buildings of the past to visit them for enjoyment and learn ______ life was like when they were first built.
【简答题】解方程: (1)3(2x﹣1)﹣2(1﹣x)=0; (2) (2x﹣5)= (x﹣3)﹣ .
【单选题】2005年,中国的对外贸易总额约为1.4万亿美元,中国当年的GDP约为18万亿人民币,当年的平均汇率是8.2元人民币/美元,则当年中国的对外贸易依存度约为( )
【单选题】The Great wall is the only one of the buildings on the earth_____ seen from the moon.