My brother will start school tomorrow, I haven t done some questions, help!

1.The original price of 80 yuan schoolbag is (68) yuan, and it is cheaper (12) yuan after the discount.

2.75 of a job has been completed, and there are (25) unfinished, and the completed part is the unfinished part (300).

3.The radius of the circle is increased by 4 cm, the diameter by (8) cm, and the circumference by (cm.

4.The number of symmetry axes of an equilateral triangle is (75) of the number of symmetry axes of a square 5The circumference of the great circle is 3 times the circumference of the minor circle, the area of the great circle is (9) times the area of the small circle, and the diameter of the great circle is (3) times the diameter of the small circle, 6

When drawing a circle with a compass, the fixed point is called the circle (point), and the line segment from this point to any point on the circle is called the circle (radius).

7.The greening team planted 125 trees, five of which did not survive, and the survival rate was (96) meters was 8 meters of 50, and 8 meters was 4 meters of 200 The pass rate of a product was 95 percent, and 25 defective products were detected from the samples, and there were (500) samples.

1 80*5 8=50 yuan, 80-50=30 yuan; 2 。25；25/75

3 diameter is 2 times the radius, 8 cm, the circumference increases by 8 cm; 4 75%

I've changed the order.

1: Connection. Peanuts are pressed for oil.

Sheepskin leather shoes.

Duck down jacket.

Sorghum stuffed oil.

Cane sugar. 2: Fill in the symbols skillfully.

Use addition, subtraction, multiplication, division, and parentheses to turn the following equations into equations.

1/2 + 1/2 - 1/2 - 1/2 = 1/02 * 1/2 1/2 2 2 = 1/12 + 1/2 + 1/2 = 1/22 + 1/2) 1/2 = 1/32 + 1/2) 1/2 1/2 2/2 1/2 1/2 2/2 1/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2 2/2 + 1/2 + 1/2 + 1/2 + 1/2 + 1/2 = 1/22 + 1/2) 2/2 = 1/32 + 1/2) 1/2 = 1/2 + 1/2) 1/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2 2 = 1/2 2 2 2 = 1/2 2 2 2 = 1/2 2 2 2 = 1/2 2 2 2 2

The color of spring grass is far away, but there is none.

The lotus flowers are different red on the summer day.

Autumn dew is like a pearl, and the moon is like a bow.

In winter, thousands of trees and pear blossoms bloom.

1. Connection: peanuts - oil extraction, sheepskin - leather shoes, duck down - down jacket, sorghum - wine (you write it as oil), sugarcane - sugar.

3. Spring - grass color... Summer - Reflecting the sun... Autumn - dew... Winter - a thousand trees...

At this time, the elementary school bar, peanut candy, sheepskin leather shoes, duck down jacket, sorghum grain and oil, cane sugar.

1/2 — 1/2 ) + 1/2 - 1/2) = 1/02 + 1/2 + 1/2 - 1/2 = 1/12 + 1/2 + 1/2 = 1/22 + 1/2 ) 1/2 = 1/32 (1/2 1/2 2/2) = 4 Autumn --- dew like a pearl and the moon like a bow.

The color of spring grass is far away, but there is none.

In winter, thousands of trees and pear blossoms bloom.

The lotus flowers are different red on the summer day.

The first question is 60 degrees (the flat angle of 180 is cut off the outer angle of dec 120 degrees);

Triangle ABC and triangle EDC

Angle acb = angle dce angle a = angle ced = 60 degrees ab = de angle angle edge can prove congruence).

The second question is that because of congruence, the problem is the sum of the side lengths of the figure, so (12+9+15)*2=72

The second question is simple. The first question is more troublesome to solve on a mobile phone. But the two problems have one thing in common: congruent triangles. Will it be done!

1. Because abe= cbe, and be ac, abc is an isosceles triangle.

2. Do Mo BC over M to O, and do GP AB to P AB to P.

Because abc=45°, so dcb=45°, hdc=45°.

And because acd= acd, adc= fec, so a= efc= dfg, so dgf is an isosceles triangle.

And because gpd=90°= ghb, bg=bg, gbh= gpb, so bpg is all equal to bhg, so gp=gh=mo, and because dpg= moc, pdg= mco, so pdg is all equal to ocm, so dg=mc=df.

3. Connect AF, because DF=FC, DHC=90°, so HF DC, and because CD AB, DHF is an isosceles right triangle, so HF=DF, and because ABC is an isosceles triangle, so AE=EC, and because FE=FE, AEF= CEF, so AEF is all equal to CEF, so DCh= DAF=45°, so ADF is an isosceles right triangle, so AD=DF=HF.

The mechanical cat is a

Santa Claus is b

a+a+a=75

3a=75a=25

b+b+b+a=115

3b+a=115

3b+25=115

3b=115-25

3b=90b=30

There are two ways to do this. 1. Set up a robot cat x yuan.

3x=75x=25

So a robot cat is 25 yuan.

Set up a Santa Claus Y dollar.

25+3y=115

3y=90y=30

Second, set up a robot cat x yuan, a Santa Claus y yuan.

3x=75x+3y=115

x=25 of the solution

y=30A: .

One is the unary equation of the column, and the other is the system of equations of the column.

Solve the equation directly, (115-75 3) 3=30

1. Solution: Set A x years old, B (2x-5+19) 2 years old, C 2x-5 years old. From the meaning of the question: x+(2x-5+19) 2+2x-5=94 to solve the code: x=b: (2

C: 2 2, solution: 10 minutes = 600 seconds 600 (3 + 2) 100 2 = 15 times 3, Xie Zhiming:

A walked: 50 3 = 150 meters, 150-20 = 130 meters The circumference of this road = 130 2 = 260 meters 4, solution: the car can catch up with the truck 60 45 15 (km) 1 minute 1 60 hours before the car catches up with the truck 1 minute before the car catches up with the truck The distance between the two cars is 15 1 60 1 4 km 250 m 5, solution:

Let the answer be which square side length is x meters, B speed is v, then A speed is 2v, and the time taken by the two when they meet is the same, which is obtained from the question: (x+5 5) v=(3x-5 5) 2v solution: x=7575 4 5=60 (tree).

Find a special point.

Because the distances from A to B and B to C are close in Figure 1, in Figure 2, T=0 is A, T=30 is C, and B is at the approximate position of T=15.

In the case of p or m, the difference in distance to c and b is obvious, which is inconsistent with Figure 2.

If it is n, the distance to a, b, and c is equal, which is inconsistent with Figure 2.

Only Q meets the conditions. Pick D.

AD is the bisector of BAC, dm ab, dc andm=dcde bisects bc perpendicularly to e

db=dc dbm and dcn are right-angled triple-angled, and dmb and dnc are right-angled.

dbm≌△dcn

bm=cn