Everyone wants to be successful. But failure is a common(普通的) thing for us to meet with.

    1, sometimes we fail the exams, sometimes in the sports meet, others 2 but we fail. So3 everybody meets with the failure in his life.

    However, different people have different4 to deal with the failure. Some people lose hope when they fail. They seem to think that it is the 5 of the world. Others, on the other hand, don't take failure 6. They seem to think that failure is the first step(步骤) to success. They will keep up and try their best7 the final success.

    Now let's imagine (猜想) the ends of the two ways. If we are afraid of the failure and always feel8, and don't try our best to change ourselves, we may meet with more and more failures. But as long as we are hopeful and brave to face them, and never give up, we will 9  successful and our dreams will come true some day.

    So, please remember: Life doesn't give us the pleasure we want. But if we never give up and10 do little by little, it will make a big difference.

在边长为2的正方形ABCD中有一个不规则的图形M，用随机模拟方法来估计不规则图形的面积．若在正方形ABCD中随机产生了10000个点，落在不规则图形M内的点数恰有2000个，则在这次模拟中，不规则图形M的面积的估计值为____ ．

快步跑上楼为什么比慢步上楼容易累？

计算：12°24′=____；56°33′+23°27′=____．