1. A cylinder with a side area of 1.44m2, a height of 0.9m and a bottom perimeter of? 2. If a cylinder with a bottom radius of 4cm and a height of 5cm is cut evenly along the bottom diameter, the surface area will increase?

1. A cylinder with a side area of 1.44m2, a height of 0.9m and a bottom perimeter of? 2. If a cylinder with a bottom radius of 4cm and a height of 5cm is cut evenly along the bottom diameter, the surface area will increase?

①1.44÷0.9 × π = 1.6 π (m)
②4 × two × five × 2 = 80 cm2
be prone to!

1. One angle in the triangle is 3 / 2 of the second angle, and the third angle is 30 ° greater than the sum of the two angles. Calculate the degrees of the three angles (calculated in different ways) two As shown in the figure. AB / / CD, GH and HM are bisectors of ∠ AGH and ∠ CHG respectively. What is the positional relationship between GM and HM? Try to explain why No need for the second question. I've worked it out

The first question is too pediatrics: ≓ (because it means) ∠ 3 - (∠ 1 + ∠ 2) = 30 ° and ∠ 1 + ∠ 2 + ∠ 3 = 180 °
‡ (so it means) ∠ 1 + ∠ 2 = (180 ° - 30 °) ÷ 2 = 75 °∠ 3 = 75 + 30 = 105 °
∵∠1=3/2∠2 ∴3/2∠2+∠2=75°∴∠2=75÷（3/2+1）=30°∠1=75— 30=45°
Answer: ∠ 1 = 45 °∠ 2 = 30 °∠ 3 = 105 ° (ask for details you don't understand)
Question 2: where's your picture?

1、（ χ 2－ ν 2）÷（ χ＋ν） 2、（24m3n－16m2n2+mn3）÷（－8m） 3、[（ χ＋ν） 2－（ χ－ν） 2＋4 χν] ÷（－2 χ） 4、[（ χ＋ν） （ χ－ν）－ （ χ－ν） 2]÷（4 ν） 5. The area of a rectangle is 12 χ two ν－ ten χ 3, width 2 χ 2. Find the circumference of the rectangle 6. It is known that ▏ a +? ▏ + (B-3) 2 = 0, Find algebraic expression [(2) α＋ b）2＋（2 α＋ b）（b-2 α）－ 6B] ÷ (2b) 7、[（ α+ b）2－（a-b）]÷（ α+ b）＝ The sixth question is revised to read: Change the question mark to half

1. X-V is determined by the square difference formula χ 2－ ν 2 = (x + V) (X-V), the original formula = (x + V) (X-V) ÷（ χ＋ν） = x-v
2. - 3m2n + 2mn2-1 / 8n3 can be divided by (- 8m)
In addition, m3 ÷ M = m (3-1) = m2, M5 ÷ M2 = m (5-2) = m3
3. -4v first calculate【（ χ＋ν） 2－（ χ－ν） 2】 4xv is obtained by using the complete square sum / difference formula
So the original formula = (4xv + 4) χν） ÷（－2 χ）= - 4v
4. 1 / 2 (X-V) extract the common factor first（ χ－ν） have to
【（ χ＋ν）－ （ χ－ν）】 （ χ－ν） ÷（4 ν）= 2v（ χ－ν） ÷（4 ν）= 1/2(x-v)
5. 4x2 + 12v-10v rectangular area formula: Area s = length ax width b, so length a = (12) χ two ν－ ten χ 3)÷2 χ 2=6v-5x
Rectangular perimeter formula: perimeter C = 2 (a + b), so perimeter C = 2 (6v-5x + 2 χ 2）=4x2+12v-10v
6. A = - 1 / 2 b = 32A + B-3 ▏ a + 1 / 2 ▏ ≥ 0 (B-3) 2 ≥ 0 because the sum of two numbers not less than 0 equals 0, they must all be 0, so ▏ a + 1 / 2 ▏ ≈ 0 a = - 1 / 2 (B-3) 2 ≈ 0 B = 3
7. There seems to be a problem
There are many methods for finding algebraic expressions, including merging congeners, extracting common factors, calculating what is in parentheses first, and then outside parentheses
Don't give your homework to others because you haven't learned anything and can't do it. Ask your teachers and classmates so that you can learn something and stop using whiteness

Fill in the appropriate words () birds () bees () clouds () boats () seas () forests

(lovely) bird
(industrious) bee
(snow-white) clouds
A small boat
(VAST) sea
(dense) forest

Write a beautiful sentence with the words "sunshine, sea and white sail"

The white sails in the sun soared in the arms of the sea

What sunshine, what clouds, what sea, what clouds, what grassland, what sky

Brilliant sunshine, white clouds, deep sea, colorful clouds, vast grassland and blue sky