On the joint boat paddling point lake into a painting, how to draw a simple boat

Boat paddling point lake into a painting.

The horse-drawn cart trampled on the ground for the song.

b. Laborious leverage.

The resistance arm of water is long, and the power arm of man is short.

According to the title, it can be classified according to the situation that these three special sailors are included among the selected sailors: If only one of the four sailors selected can only be a sailor with a right hand, there are C7 (3 above) and C4 (4 above) selections; If there are 4 sailors selected who can only be on the right-hand side and 1 sailor on the left-hand side, there are C2 (1 above) C 7 (3 on the top) C4 (3 on the top); If there are 1 right-hand sailor and 2 left-handed sailors among the 4 sailors selected, there are C7 (3 above) and C4 (2 above); If only 1 of the 4 sailors selected can only be on the left hand side, there are C2 (1 above) C7 (3 above) selections; If there are 2 sailors on the left hand side of the 4 sailors selected, there are C7 (2 above) and C5 (4 above) selections, and according to the principle of classification and counting, the different selection methods add them up to a total of 700 types.

The other 2 people can sit in the middle, and there are only 8 seats on the boat.

This problem is a probability, it is a question that selects eight out of ten people, the main thing is that it conditionally restricts three people to be on the left or right, and you have to choose all or a few of these three people to discuss, and you can calculate the specific steps yourself? I don't have scratch paper right now. Hope.

There are a lot of stick figures in this spring or belt, go and see the bar group sale.

Bag you are satisfied! Pick the reeds.

You can just follow the picture.

I know, you came to Earth to find me.

The easiest:

On the top is a triangle, with the long side vertical, and is the sail.

The lower side is an inverted trapezoid, the upper side is long and the lower side is short, and the hull is made.

The tail rotor is to the right, or the left paddle is inward, or the right paddle is outward.

The pulp is also in the southeast direction, that is, how to turn, the pulp will exceed that direction, imagine that the pulp is fixed, and the water flow has a force to push the pulp, and the force is mutual.

Colored pencils, colors can be drawn, try it.

This problem? The first thing to do is to hook his hook well.

If life is a long song, my steps are leaping notes. If the ideal is the distant shore, my efforts are a small boat that will always move forward. If the ideal is a flying bird, my action is a pair of wings flapping tenaciously.

If the ideal is a tower that stands tall in the sky, my contribution is a solid ladder. If the future is an edifice, every day's efforts are the bricks and tiles of the edifice. If nature is a beautiful picture, my mind is the pen that paints the picture.

If the school is a towering tree, I am a fruit about to ripen.

If the motherland is a towering pagoda, my contribution is a ladder to climb upward.

If the motherland is a majestic edifice, my efforts are to build the edifice brick by brick.

If the motherland is a long-distance expeditionary ship, we are the sails raised.

If the motherland is a beautiful picture, my soul is a colored pen that paints a picture.