300–150 =____    300+105 =____    80+120=____

315–200=____     800–600 =____    205+50 =____

5×2+24 =____    16÷4+20 =____    35 + 15-40 =____

①把图A按2：1的比放大．  2、把图B绕O点顺时针旋转90°．

②把图C向左平移5格，再向上平移6格．

③画出图D的另一半，使它成为一个轴对称图形．

阅读理解，根据短文选择正确的一项。

    One day Mr. and Mrs. White went shopping by car. They stopped their car near a store. They bought a lot of things and they wanted to put the things in the car. But Mr. White couldn't open the door of the car, so they asked a policeman to help them. The policeman was very friendly to help them. Just then a man came up and shouted:“ What are you doing with my car?” Mr. and Mrs. White took a look at the car's number and they were frozen（僵住了） there. It wasn't their car.