Please help, take a look, and you ll know after you read it

There are only better women, and there is no best woman, now she is undoubtedly the best in your eyes, because liking someone will make you blind, I advise you not to provoke her good, because she is likely to use you as a substitute for the period of emotional loss, such a relationship is the most unreliable, because no matter what small mistakes you make in the future, she may also be compared with her previous boyfriend, and it is you who suffers. It doesn't matter who fulfills whom, when you fulfill him, you also fulfill yourself.

v Love is a matter of two people, if she doesn't want to accept you, don't force it in, if she also wants to be with you, love her sincerely.

You can't go in and follow fate. God let you know and become good friends, even if it is fate for you. Now the rest of the matter depends on your own efforts.

As the old saying goes: if people do not do it for themselves, the heavens and the earth will perish. Another word: Those who sled people in the corner of the wall must not die well. Both - horizontal and dead, vertical and dead - have no choice but to let nature take its course, and let it be created.

What does that woman think! If only she had been his current boyfriend. Fulfill her.

1) When a=3, b=4, a2+b2+2ab=(a+b)2=49 2) The answer is not unique, the formula is written correctly (bend 1 point), and the factorization is correct to bury the first to give For example, if a2, b2 is chosen, then a2-b2=(a+b)(a-b) If a2, 2ab is chosen, then a2 2ab=a(a 2b).

1. I don't need to say anything about the circumference.

2. The vertical two are equal to the height of 40, and the horizontal one is equal to the ad-two widths, that is, 48-2x

3. The area is first expressed by x, 40x of two, and the area of one (48-2x)x is multiplied by 2 13 of the trapezoidal area to get x

(1) In the AB section, the frictional force is constant and is always opposite to the direction of motion. And here friction is the only factor that affects the conservation of mechanical energy.

So fs=mgh, which gives us the total distance S

2) In the final state, the ball reaches point B at the highest level, and then reciprocates on a circular track, and no longer goes on the AB track.

Therefore, the velocity at point b is 0, and it is easy to find the velocity at point e, and then the centripetal force can be found. Plus MG, it's the pressure of the track.