Mike is short and fat, ____in the class.
根据以上算法,可求得 f(−1)+f(2)= ____.
①对顶角相等;
②相等的角是对顶角;
③若两个角不相等,则这两个角一定不是对顶角;
④若两个角不是对顶角,则这两个角不相等.