How to draw ten small squares with four strokes per square

Draw 9 squares, each small one = 9
One for every four adjacent small ones = 4
The largest one = 1
One, 14

Three strokes and five squares
There are five squares, two above and three below. Two of them are in the middle of the three above. Strokes cannot be repeated,
Yeah, I want four, too,

This is an extension of the stroke problem
This figure has 8 odd vertices, so it needs at least 4 strokes to draw
Simple explanation: one stroke can destroy two odd vertices at both ends at most. When passing through other vertices, one in and one out will not change the parity of vertices. Just try
[supplement]
You can't draw three strokes. Don't try

How does a triangle add a line segment to become two triangles?

The line segment obtained by connecting any vertex and any point on its opposite side except two endpoints can divide the original triangle into two triangles. If it is divided into two triangles of equal area, the middle line of the triangle should be drawn

Xiao Ming's new house needs 3200 pieces of square bricks with a side length of 5 decimeters to lay the floor. If we use square bricks with a side length of 8 decimeters, how many pieces do we need

（5×5）：（8×8）=x：3200
X=1250

It takes 2000 pieces to lay a piece of land with 20 cm long square bricks. If you use 40 cm long square bricks, how many pieces do you need?

Let x block be required, 40 × 40 × x = 20 × 20 × 2000, & nbsp; & nbsp; & nbsp; 1600x = 400 × 2000, & nbsp; & nbsp; & nbsp; 1600x = 800000, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 500; a: 500 block is required

Xiao Ming's living room floor tiles, if you need 150 small square bricks, if you use generous bricks, how many? Will the living room full, choose which kind of brick cheap?
Small square brick 4 decimeters x 4 decimeters, 15 yuan each, big brick 5 decimeters x 5 decimeters, 20 yuan each

4 * 4 * 150 / (5 * 5) = 96 pieces * 20 = 1920 yuan
Small 150 * 15 = 2250 yuan

Xiaoming's living room is paved with floor tiles. The small square brick is 16dm2, 5 yuan per piece. The big square brick is 25dm2, 8 yuan per piece?
Say all the steps

Living room area: 150 * 16 = 2400dm2
2400 / 25 = 96 pieces
Big bricks need 96 pieces

Xiao Li's new household side length is 80 decimeters of floor tiles to lay the ground, need 200 pieces, if the use of an area of 1 square meters of brick to shop
How many pieces does it take to lay the ground? How many square meters is the area of her new house? It's ten minutes fast
Using proportional knowledge to solve series equation

0.8 * 0.8 * 200 = 128 square meters
-- if 1 square brick is used, it will be 128
If you don't count 800 brick losses

The living room is 5 meters long and 4 meters wide. The floor tile specification of the living room is 60 * 60, and the unit price is 15 yuan

Each brick is 0.36 m2; 56 bricks are needed to divide the two;
Conservatively, 60 yuan; 900 yuan;
The cost is 12 yuan per square meter, 240 yuan per square meter;
You need about $1200 to do it~

Shop floor tiles, choose 60 cm, 80 cm floor tiles are just full, Uncle Wang's living room area is at least how many square meters

As shown in the picture

How to draw ten small squares with four strokes per square