A few math problems, too late to do it.

1. Solution: Let the smaller angle be x degrees.

1+1+2）x=180

The inner angles of x=45 are: apex angles: 2 45=90

Base angle: 45 is an isosceles right triangle.

2.Solution: If there are x people in one group, then the second group is 3 2x people, and the third group has 15 8x people.

1+3/2+15/8）x=140

x=32 for 32 people in group 1, 32 3 2=48 for group 2, group 3 for group 3, 48*5 4=60

3.A: B = 3:4

B: C = 2:5 = 4:10

A:B:C = 3:4:10

4.Distance: Ming:

Strong = 11:10 Speed: Ming:

strong = 6 11:5 10 = 12:115

I don't understand. 6.Solution:

Let A have 3x yuan and B have 4x yuan.

3x-50:4x+50=1:2

6 x-100=4x+50

x=75A: 75*3=225 yuan.

B: 75*4=300 yuan.

x=4545 45 90 isosceles right triangle.

2,.x+(3 2)x+(3 2)*(5 4)x=140x=32 Group 1 32 Group 2 48 Group 3 Group 305(1992-x):

1993+x)=2:3x=3986.(x-50):

4 3x+50)=1:2x=225A225 B225*4 3=300

1.Isosceles right triangle 90 45 45

Working overtime on weekends and not having enough time.

60x30-30²

After cutting the largest semicircle, the surface of the paper is 387 square centimeters.

Rectangular mammoth bond area - semicircular area = remaining area.

Length 60, width 30, then the length can be just sold as a semicircle of straight balance slow comic diameter, the radius is 30, just the same as the width, that is to say, not to draw a circle, draw to the rectangle outside, is just right, so the largest semicircle which argument.

Find the remaining area.

It is the rectangular area s1, the semicircle area s2, and the remaining area is s1-s2s1-s2387 (cm).

Divide 2083 by 16 to take the remainder. Columns are vertically matched with such a line to stop: file orange beard.

Solution: Set up a grandmother to raise x roosters.

3x-8=25

3x=33x=11

A: Grandma has 11 roosters.

At first glance, I didn't pay attention to the lectures.