Ask a math problem about triangle in grade one of junior high school In the triangle ABC, the angle c = 90 ° ad bisects the angle ABC, and the angle B = 3 times the angle bad I drew a picture, but I don't know how to pass it on. I hope you can draw the picture yourself,

Ask a math problem about triangle in grade one of junior high school In the triangle ABC, the angle c = 90 ° ad bisects the angle ABC, and the angle B = 3 times the angle bad I drew a picture, but I don't know how to pass it on. I hope you can draw the picture yourself,

Because angle c + angle cab + angle B = 180 degree, angle c = 90 degree, so angle cab + angle B = 180 degree - angle c = 90 degree. Suppose: angle bad = a, then angle B = 3 times angle bad = 3A. Because ad bisects angle ABC, so angle DAC = angle bad = a, angle cab + angle B + 90 degree = angle bad + angle DAC + angle B = 90 degree, that is: a + A + 3A = 90 degree solution, a = 18 degree, angle ADC = 180 degree - angle c

As shown in the figure, given the line segments a, B and C, draw the line segments with a compass and ruler so that they are equal to a + 2b-c

1. Draw a straight line as long as possible with a ruler, and determine a point on the line. A2. Cut line a with a compass, take a as the end point, and cut AB = A. 3. Similarly, cut B with a compass, take B as the end point, and cut BC = B. 4. Repeat step 3, take C as the end point, and cut CD = B. at this time, ad = a + 2B. 5

One coat + one pair of trousers = 80 yuan, one coat + one hat = 57 yuan, one hat + one pair of trousers = 53 yuan
How much is a coat, a pair of trousers and a hat? Urgent! Urgent! Urgent! Urgent! Urgent! Urgent! Urgent! Urgent! Urgent! Urgent! Urgent!

One coat + one pair of trousers = 80 yuan + one coat + one hat = 57 yuan - one hat + one pair of trousers = 53 yuan = 2 coats △ 2 = 42 yuan (coat)
Pants 80-42 = 38
Cap 57-42 = 15

In the equal ratio sequence {an}, if the common ratio is q = 2 and s99 = 77, then A3 + A6 + A9 a99=?
The answer is 308

Because q = 2, a (I) + a (I + 1) + a (I + 2) = (1 / 4 + 1 / 2 + 1) a (I + 2)
Then A3 + A6 +... + A99 = 4 / 7 ((a1 + A2 + a3) + (A4 + A5 + A6) +...) = 44

(1) 07 liters, 4 cubic decimeters, 700 cubic centimeters, 4 liters, 7 milliliters, in the order from large to small. (2) 30 hectares, 3 square kilometers, 330 square kilometers
(1) 07 liter, 4 cubic decimeter, 700 cubic centimeter, 4 liter, 7 ml. order from big to small
(2) 30 hectares, 3 square kilometers, 330 square meters, 3000 square decimeters, in descending order
(3) Three and a half hours, 3.4 hours, 3 hours, 40 minutes, 200 minutes

(1) 7 L, 4 L 7 ml = 4. 007 L. according to the order from large to small, 4 L 7 ml > 4. 07 l > 4 L 7 ml (2) 30 ha = 300000 m2, 3 km2 = 300 ha, 330 m2, 3000 m2 = 30 m2

The original plan of a convoy transporting a batch of disaster relief materials was to travel 60 kilometers per hour, 6 hours to reach the actual 78 kilometers per hour. How long does it take to complete the whole journey

Time = 60 × 6 △ 78 = 60 / 13 hours

How many cubic meters is one kilogram
How many cubic meters is 2164 kg stone equal to
How many cubic meters is 986 kg of sand
How many cubic meters is 686 kg of cement

Specific gravity of stone: 2.3.2 tons / cubic meter specific gravity of yellow sand: 2.2.9 tons / cubic meter specific gravity of cement: 3.1 tons / cubic meter 2164 kg specific gravity of stone: 2.164 tons / 3 tons / cubic meter = 0.721 cubic meters 986 kg specific gravity of sand: 0.986 tons / 2.8 tons / cubic meter = 0.352 cubic meters 686 kg specific gravity of cement is equal to

2（4-5x）-3（x-3）=43

2（4-5x）-3（x-3）=43
8-10X-3X+9=43
17-13X=43
13X=17-43
13X=-26
X=-2

A cylinder with a height of 5 cm is sawed into two pieces along the diameter of the bottom surface, and its surface area is increased by 40 square centimeters. The original volume of the cylinder is______ ．

The diameter of the cylinder: 40 △ 2 △ 5 = 4 (CM); the volume of the cylinder: 3.14 × (4 △ 2) 2 × 5, = 3.14 × 4 × 5, = 62.5 (cm3); answer: the volume of the cylinder is 62.5 cm3. So the answer is: 62.5 cm3

How to use the numbers 2, 3, 7 and 9 to make it equal to 24

(7-2)*3+9=24