10 000 x1000 - 1 818 880: (87x78 - 412 300 : 70) x 970

Circle the correct verb.
1)We finished/have finished our work.It's time to have a rest now.
2)In the last lesson the students took/have taken a very difficult test.
3)We did/have done this exercise.Give us the next one.
4)No,thank you.I ate/have eaten too much.
5)Eight Russian spotsmen  became/have become  world champions two days ago.
6)I lost/have lost my key.Can you help me to open the door? 

найти площадь ромба с тупым углом 150, если его сторона равна 1дм. (решение без синуса)