(1) In a right triangle, the ratio of the two acute angles is half, and the two acute angles are () degrees and () degrees respectively (2) If the number of male students is five sixths of that of female students, the ratio of male to female students is (), what is the percentage of male students in the total number (3) One third of a is equal to one fourth of B. If a is 90, B is () (4) One seventh of a book can be read every day in () days. After reading it for three days, how many pages are there (5) Xiaohong walks two thirds of an hour and eighteen fifths of an hour. She walks () kilometers per hour, and it takes () hours for her to walk 1 kilometer on average

(1) In a right triangle, the ratio of the two acute angles is half, and the two acute angles are () degrees and () degrees respectively (2) If the number of male students is five sixths of that of female students, the ratio of male to female students is (), what is the percentage of male students in the total number (3) One third of a is equal to one fourth of B. If a is 90, B is () (4) One seventh of a book can be read every day in () days. After reading it for three days, how many pages are there (5) Xiaohong walks two thirds of an hour and eighteen fifths of an hour. She walks () kilometers per hour, and it takes () hours for her to walk 1 kilometer on average

1、30,60
2、5：6；5/11
3、120
4、7；4/7
5、27/5；5/27

In an isosceles triangle, the known vertex angle is two fifths of the base angle. How many degrees of the base angle?
In an isosceles triangle, the ratio of the base angle to the vertex angle is 4:1. How many degrees of the vertex angle?

 
180 ÷ (1 + 1 + 2 / 5) = 75 (°)
180 & nbsp; × (4 + 4 + 1 / 1) = 20 (°)
 
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One and a half tons of wheat can produce five sixths of a ton of flour. According to this calculation, how much wheat is needed to grind three fifths of a ton of flour?
2. My uncle drives from Fuyang to Hangzhou. He takes one fourth of the whole journey in 0.2 hours. About two-thirds of the journey is from Fuyang to Liuhe tower. How many hours does it take from Fuyang to Liuhe tower?

(5/6)/5=1/6
(2/3)/(1/6)=4
Four tons
Speed = (1 / 4) / 0.2 = 5 / 4
（2/3）/（5/4）=8/15
(32 minutes) 8 / 15 hours

A room 4.8 meters long and 3.6 meters wide needs 768 pieces of square tiles with a side length of 0.15 meters. In a room 6 meters long and 4.8 meters wide, how many pieces of the same tiles do you need? If in the first room to pave 0.2 meters square tiles, how many pieces to use? (solve by proportion)

As a square with a side length of 0.15 meters, a square x block of a square with a length of 0.15 meters, and the (0.15 × 0.15) x = 6 × 4.8-8.8 (6.15 × 0.15) x (0.15 × 0.15) x = 6 × 4.8 (6 × 4.8, 6 × 4.8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 × 4.8.8 × 4.8-4.8 × 4.8-4-4-8-4-8-4-8-4-8-4-8-4-8-4-8-4-4-8-6-6-6-8-8-8-8-4-8-4-4-8-4-4-4-8-4-4-6-6-4-4-6-8-8-8-6-6-6 for example, & nbsp; & nbsp; &Answer: 1280 squares with 0.15m side length and 432 squares with 0.2m side length are required

Letter formula area of square and rectangle

Square
Area: S = a ^ 2 or S = a * a
Perimeter: C = a * 4
rectangle
Area: S = ab
Perimeter: C = 2 (a + b)

The circumference of the circle is "×", which is indicated by the letter C = "

The circumference of a circle = "circumference ratio" × "diameter", expressed in letters, is C = "π D" [D is diameter]

The circumference of a circle is equal to or the circumference of a circle is equal to

The circumference of a circle is equal to [PI multiplied by diameter] or [PI multiplied by 2 times radius]. Use letters to indicate that C equals [π R] or C equals [2 π R]

If a = 4.06cm, B = 8cm
What is the area and perimeter of this rectangle?

s=ab
c=2（a+b）
s=ab=4.06*8=32.48
c=2（a+b）=2*（4.06+8）=24.12

Why use the letter C for perimeter? And why use the letter S for area? Please give me a correct answer

First of all, correct a small problem: in more cases, perimeter should be expressed with capital "C" and area should be expressed with capital "s"
Well, C is the abbreviation of the English letter circle reference, and S is the abbreviation of the English letter square. There are many similar letters, most of which have this origin

It 2, 1, 6 three number card exchange position, row can be 43 divided into three digits, how to row
brain twists

Turn the number 6 to 9
So it's 129, which is three times as much as 43