How many different ways do you use 24 squares of 1 square centimeter to make a big rectangle? What are their girths? Spell it and fill in the table below. Length (CM) width (CM) circumference (CM)

The area of the figure remains unchanged. The length and width of the rectangle can be divided into the following situations: (1) length 24 cm, width 1 cm, perimeter: (24 + 1) × 2 = 50 (CM); (2) length 12 cm, width 2 cm, perimeter: (12 + 2) × 2 = 28 (CM); (3) length 8 cm, width 3 cm, perimeter is

How much calcium carbonate can react with an appropriate amount of hydrochloric acid when 66 g of carbon dioxide is withdrawn in the laboratory?

Solution: calcium carbonate with appropriate amount is X
CaCO3+2HCL=====CaCL2+H2O+CO2
100 44
X 66
X = 150 g

3 times the square of x plus x is equal to 1. Find the value of 6 times the cube of X + 11 times the square of X + X

6*x*x*x + 11*x*x + X = (6*x*x + 11*x +1)* X= ((2*X+3)*(3*x+1)-2)*x
= (2*X+3)*(3*x+1)*x-2*x = 2*x+3 -2*x = 3

What numbers can be set up with four beads in mathematics test paper of grade one volume two

1234 4321 1324 1423 1342 1432 2134 2314 2431 2413 2341 2314 3214 3124 3241 4123 4132 4231 4213 4312 4321.

Use 2, 4, 6, 8, 9, 16, 18, 24, 36, 72 to write multiplication formula

(1) From the first to the nineteenth, one first, two second, three third, five fifth, eight eight, nine nine, two two are special forms. Other ordinal numbers are composed of the corresponding cardinal number words followed by "th"

For example: what is the least common multiple of 57.95.38? How to calculate it?

57=19x3
95=19x5
38=19x2
19x3x5x2=570
The least common multiple of 57.95.38 is 570

Some problems about congruent triangles
1. Master workers often use a square to divide any corner equally,
The angle of AOB is an arbitrary angle. Take om = on on the side OA and ob respectively. Move the angle ruler so that the same scales on both sides of the angle ruler coincide with m and N respectively. The ray OC passing through the vertex C of the angle ruler is the bisector of AOB. Why?
2. Make bisector of ∠ AOB:
(1) take o as the center of the circle and the appropriate length as the radius to make an arc, intersecting OA with m and ob with n
(2) take M and N as the center of the circle, and the length greater than 1 / 2Mn as the radius, respectively. The two arcs intersect at point C in the interior of ∠ AOB
(3) make ray OC. Ray OC is the required value
Bisecting the angle ∠ AOB. After obtaining the ray OC through the above steps, extend it reversely to obtain the straight line CD. What is the relationship between the straight line CD and the straight line AB?

The distance from the point on the bisector to both sides of the corner is equal
2 CD perpendicular to ab

How to write 2 o'clock in English

two o'clock

About 500 words in a composition
Forest fire prevention experience, you help!
About 500 words

On a sunny morning, sister squirrel and some of her friends were jumping among several trees. They had a good time. Suddenly, aunt vole sighed, "ah! Now people's awareness of forest fire prevention is getting worse and worse. They throw cigarette butts and lighters everywhere. The vegetation in the forest is getting less and less. The lush forest has become a bare broom now." sister squirrel, listen, "Yes, because of human's inattention, the scope of our play is getting smaller and smaller." as soon as the voice fell, there was a scream of animals from the east of the forest. In the middle of the Scream: "fire, fire, everyone run away!" the squirrel listened, Cried out: "everyone run!" everyone fled out of the forest. But brother squirrel suddenly thought: the weak and sick mother has not escaped! He rushed into the sea of fire regardless of everything. The fire was raging and jumping. In a short time, the little fire became the devil's claw and extended to brother squirrel. Brother squirrel never escaped and died. The devil still didn't stop, slowly, The forest has become a ruin. The beautiful home of animals is now in the hands of human beings
The animals were very angry and determined to revenge for the dead animals and plants. Overnight, all the animals rushed into the city, caught the arsonist and brought him to the lion king. The lion king saw it and roared, "you are the arsonist?" "I. I. yes." without saying a few words, he knelt down on the ground and begged the king to spare his life. "Yes, but you have to help us rebuild our home, Don't hurt us any more, raise the awareness of fire prevention, OK? "He agreed
After that, a lecture on forest fire prevention awareness will be held every month to let people know the importance of arson
Or people's tools, but if they are not used properly, it will lead to serious consequences. So we have to pull the "defense line" since childhood, improve our fire prevention awareness, and strive to be the "little guard of forest fire prevention"!

Primary school grade 5 Volume 2 mathematics unit evaluation Volume 3 answer urgent! Online, etc

85 - 13 =7289 - 81 =878 - 62 =1652 - 17 =3530 + 55 =8599 - 48 =5178 + 20 =9831 - 14 =1779 + 20 =9920 + 42 =6277 - 38 =3988 - 63 =2555 + 43 =9822 - 19 =314 + 58 =7219 + 79 =9824 + 30 =5452 - 10 =2

How many different ways do you use 24 squares of 1 square centimeter to make a big rectangle? What are their girths? Spell it and fill in the table below. Length (CM) width (CM) circumference (CM)