【简答题】定义a※b=a 2 ﹣b,则(1※2)※3=( )
【简答题】定义运算a*b= a 2 - b 2 ,a⊕b= (a-b ) 2 ,则函数f(x)= 2*x (x⊕2)-2 的奇偶性为______.
【判断题】资产是指企业过去的交易、事项形成的,由企业拥有或者控制的,预期会带来未来经济利益的资源。()
【简答题】对实数a、b,定义“★”运算规则如下:a★ b= b(a≤b) a 2 - b 2 (a>b) ,则 7 ★( 2 ★ 3 )=______.
【简答题】定义一种新运算a⊕b=2a-b,a?b=b-a,求(2⊕3)⊕(3?2)=______.
【单选题】What is the talk mainly about?
A.
Overland transportation in the nineteenm century.
B.
Historical aspects of mail delivery.
C.
Vehicles currently in use by the postal service.
D.
The invention of the railroad.
【单选题】资产是指企业过去的交易或事项形成的、由企业拥有或控制的、预期会给企业带来经济利益的静态会计
【单选题】The city council spent a lot of budget to______ the old castle and other places of historic interest.