5 math problems below hurry .

÷2＝40（cm）

375 (square centimeters).

4 24 (cm) (length of one length, one width, one height and) 384 (cubic centimeters).

Answer: The three numbers are .

4. From the ratio of the three angles is 1:1:2, it can be seen that this is an isosceles right triangle.

So the side length is 60 (1 + root number (2 + root number (2 + root number 2) The other questions are all elementary school, the calculation of this question uses the knowledge of middle school, are you writing the wrong question, the ratio of the three corners is 1:1:2, should it be changed to the ratio of the three sides is 1:

1:2, at this time.

A = 15cm B = 15cm C = 30 cm) 5, divided into two situations: (1) the ratio of the three sides is 2:2:3, then the waist = 108 2 7 = 216 7 (cm).

Bottom = 108 3 7 = 324 8 (cm).

2) The ratio of the three sides is 2:3:3, then the bottom = 108 2 8 = 27 (cm) waist = 108 3 8 = 81 2 (cm).

1.The ratio of length to width is 5:3, and if the length and width are 5x and 3x respectively, then there is 2(5x+3x)=80, and the solution is x=5, then.

The area is s=5x*3x=375(cm2).

2.Let the length, width and height be 3x, 2x, x, then there is 4(3x+2x+x)=96, and the solution is x=4, then the volume is v=3x*2x*x=384(cm3).

3.Let these three numbers be 5x, 2x, x, then there is 5x+2x+x=3*80, and the solution is x=30, then these three numbers are.

4.According to the sinusoidal theorem, if the ratio of the three sides is the same as the ratio of the triangle, then the three sides can be x, x, 2x, then there is x+x+2x=60, and the solution is x=15, then the length of the three sides is 15, 15, 30.

Or first solve the triangle from the ratio of the angles and the sum of the triangles to 180, and then know that the triangle is an isosceles right triangle, and the ratio of the three sides can also be obtained, and then the length of the three sides can be obtained.

5.If the ratio of the three sides is 2:2:3, then set to 2x, 2x, 3x, then there is 2x+2x+3x=108, and the solution is x=108 7, then the bottom side length is 324 7

If the ratio of the three sides is 2:3:3, then let it be 2x, 3x, 3x, then there is 2x+3x+3x=108, and the solution is x=27 2, then the length of the ground side is 27

The above is the solution of these five problems, when calculating the problem about the ratio in the future, you can set the unknown according to the ratio in this way, then the value of the unknown can be solved according to the relevant conditions, and then the required things can come out!

1. Set length x and width y

x+y=40, x:y=5:3, x=25, y=15, and the area is xy=375

2. Set length x, width y, height z

x+y+z=48, x:y:z=3:2:1, x=24, y=16, z=8, and the volume is xyz=24*16*8=3072

3. Let these three numbers be x, y, and z respectively

x+y+z=160，x:y:z=5:2:1，x=100，y=40，z=20

4. Set the three corners are x, y, and z

x+y+z=180 degrees.

x:y:z=1:1:2, x=45 degrees, y=45 degrees, z=90 degrees, then it is a right-angled isosceles triangle.

And the circumference is 60, and the length of the three sides is 60-30 2, 60-30 2, 60 2-60

5. If the three-sided ratio is 2:2:3, then the waist is X, and the bottom length is Y

2x+y=108, x=108 7, y=540 7, but 108 7+108 7 is less than 540 7, then it is not true.

The trilateral ratio is 2:3:3

x=,y=27, then the waist is, and the bottom surface is 27

1 Let the width be x (5 3x+x)*2=80 x=15 and the length is 25 15*25=325

2. I don't understand what the wheel chief means.

3 Let the smallest number be x (5x+2x+x) 3=80 x=30 and the other two numbers are 60 150

4. Let the two angles of the triangle row be the same x x+x+2x=180 x=45 It can be seen that this is an isosceles right triangle, and the right angle side of the isosceles right triangle line is half of the bottom edge, and the perimeter of this triangle is right angle side + right angle edge + hypotenuse (2 right angle sides) = 60 The right angle side is 15 The area is 15 * 15 2=

5, I didn't understand, I asked about the length of the bottom edge, right?

1.2 (length + width) = 80cm

Length = 25m, width = 15cm

2.4 (length + width + height) = 96cm

Length = 12cm, width = 8cm, height = 4cm

3.Sum of three numbers = 240

a=150 b=60 c=30

4.The ratio of the three angles = the ratio of the three sides.

a=15cm b=15cm c=30cm

5.The trilateral ratio is 2:2:3 or 2:3:3

Waist = 216 7cm Bottom = 324 7cm

or waist = 81 2cm bottom = 27cm

1.Length = (80 * 5 8) 2 = 25 Width = 80 2-25 = 15 So area = 25 * 15 = 375

2.Length = (96 4) * 3 6 = 12 Width = (96 4) * 2 6 = 8 Height = = (96 4) * 1 6 = 4 So volume = 12 * 8 * 4 = 384

4.The three corners are 90, 45, 45, so the side lengths are 60 (1 + root number (2 + root number (2 + root number 2)

5.Waist: Bottom: 27

1. (5x +3x)*2 = 80 x=5 5x*3x=15*25=375

2. (3x+2x+x)*4 = 96 x = 4 3x*2x*x = 6*64=384

3. (5x+2x+x)/3 = 80 x = 30 5x = 150 2x=60 x=30

4.(x+x+2x) = 180 x =45 isosceles right triangle.

5. (2x+2x+3x) = 108 x= 108/7 2x= 216/7 3x = 324/7

or (2x+3x+3x) = 108 x = 108 8 2x = 216 8 3x=324 8

1) How much pre-tax interest can I get after maturity?

6000 yuan.

2) After paying 5% interest tax, how much is the take-home interest?

972 (1-5%) = RMB.

1) .6000 x = 324 (yuan).

2）.234 - 1 - 5% ) yuan) map.

This data is ** on the map, and the final result is subject to the latest data on the map.

Divide by 2 = 3 10 tons.

Divide by 2 5 = 5 2 =

Divide by 1 4 = 2 2x1 5 = 2 5

The reciprocal of is 6 5 (6 5 + 4 5) divided by 1 2 = 45(1 4 + 1 5) (1 4-1 5) = 9 20 divided by 1 20 = 9 hence tons.

2400-(2400-2000) 5% = 2380 (yuan) Answer: Aunt Zhang's actual monthly income after paying taxes is 2380 yuan.

800 + 2000-500 5% - (800-500) 10% = 2745 (yuan).

Answer: Aunt Qian's actual monthly income after paying taxes is 2,745 yuan.

45-500 5% = 20 (yuan) 20 10% = 200 (yuan) 200 + 500 + 2000 = 2700 (yuan).

Answer: Aunt Li's monthly income before payment in November was 2,700 yuan.

First, the area is the largest, and the two smallest faces should be connected, that is, the two smallest faces are missing. Namely:

8*5+4*5+4*8)*4-4*5*2 328 (square centimeters) is the largest, and the two largest faces should be connected, that is, the two largest faces are missing. Namely:

8*5+4*5+4*8)*4-8*5*2 288 (square centimeters) two, 12 3 4, the side length of the cube is 4, sawn into three to increase 4 faces. Namely:

12 3 4 (small cube side length).

4*4*4 64 (square centimeters).

Third, set the thickness of xm

4*6*x=6

24x=6x=four, (96-10*4) 8 7 (cm) (this is the length of the bottom side) volume: 7*7*10 490 (cubic centimeters).

5. Total volume Truncated volume The remaining volume.

30*20*20 20*20*20 4000 (cubic centimeters).

1.If you want to have the largest surface area, you need to put together the two faces with the smallest area, so the maximum surface area is 2 (8 * 5 + 5 * 4 + 4 * 8) * 2-2 * 5 * 4 = 328, in the same way, if you want to have the smallest surface area, you have to put together the two faces with the largest area, so the minimum surface area is 2 (8 * 5 + 5 * 4 + 4 * 8) * 2-2 * 5 * 8 = 288

2.Because the height is 12, the horizontal saw is exactly three cubes, so the original cuboid is 4 in length and width, and the surface area is 2 (12 * 4 + 4 + 4 * 12) = 224, and the surface area after sawing into three cubes is 3 * 6 * 4 * 4 = 288, so 288-224 = 64 is added

4.Let the length and width of the box be x, (because the bottom is square) so 4*(x+x+10)=96, so x=7, so the volume is 7*7*10=490

5.The largest cube is cut into a cube with an edge length of 20cm, so the remaining cut is 30*20*20-20*20*20=4000cm2