如图所示的直角坐标系中,三角形ABC的顶点坐标分别是A(0,0)、B(6,0)、C(5,5).求:
(1)求三角形ABC的面积;
(2)如果将三角形ABC向上平移3个单位长度,得三角形A1B1C1,再向右平移2个单位长度,得到三角形A2B2C2.分别画出三角形A1B1C1和三角形A2B2C2,并试求出A2、B2、C2的坐标.
在美苏争霸中,双方互有攻守,决定其攻守策略改变的主要原因是( )
A. Let's go.
B. Are these your shoes?
C. Let's play football.
D. They are on your feet.
E. What are they?
A:It's warm today.____
B:Great!____
A:Where are my shoes?
B:____
A:No.they aren't.
A:Look!____
B:Oh.I'm sorry.
缺碘会引起甲状腺肿大,加碘食盐中碘一般以碘酸钾形式存在,其中碘的化合价为+5,则碘酸钾的化学式为( )