Solve two problems in primary mathematics. Elementary school math problems, solving

1。The total length of this road is y.

40%*y+4+50%*y=y-36

Get y=400

2。It should be completed in 3 days.

Set the next day to repair 4x meters.

Then repair 3x meters on the third day.

On the first day repaired 4x-10

The total length of the road is 4x-10+4x+3x meters.

On the first day, 30% of the total length was repaired

So (4x-10+4x+3x)*30%=4x-10 gives x=10

The total length of the road is 4x-10 + 4x + 3x = 100 meters.

The full length of the road is x, then:

40%x+4)+(40%x+4)*50%+36=x, which gives x=105

So the road is 105m long

1.The full length of the road is x, then:

40%x+4)+(40%x+4)*50%+36=x, which gives x=105

So the road is 105m long

Question 2 What is the equation? I don't understand.

1. Design: The total length of this road is x meters.

40%x+50%x+4=36

2. 4+3=7 (parts).

1.Set the road length x meters, solve x ??

2.This is problematic!!

156/4=44

Take the midpoint F of the AD and connect it to the EF. This divides it into 4 triangles of equal base and height.

The area of the triangle dec is 156 2 = 78

Because the BC side has not changed, but the height has changed, it has become the original 1 2, so the area is halved.

1.After setting the starting price, each person will sit for 1,000 kilometers X yuan.

10+3x+6x+12x+15x=37

x=A: Yuan.

B: Yuan. C: Yuan. Ding: Yuan.

1.Solution: Set the price increase per kilometer after the starting distance is x.

Then: (19-4)*x=37-10

x=so: A should pay: 10+ yuan.

B shall pay: yuan.

C pays: yuan.

Ding should pay: yuan. 2.Be.

Question 6: If x kilograms are used for the first time, then the original flour is 5 kilograms

x+（x-5）+35=5x

2x+30=5x

x=10 then the original flour is 50 kg.

Question 7: Set the original apple x kilogram.

Columnable equation: x-3 4x + 38 = x+1 5x

x = 40

The original apples were 40 kg.

①36÷16=2……4 2+1-2=1 (盏) Don't have detailed numbers?

1. Area: 1x7=7 (square centimeters).

Circumference: (2+3)x2+2=12 (cm).

2. Area: 1x5=5 (square centimeters).

Circumference: (1+3)x2+4=12 (cm).

3. Area: 1x6=6 (ordinary centimeters).

Circumference: (1+5)x2+2=14 (cm).

4. Area: 1x6=6 (square centimeters).

Circumference: (3+3)x2=12 (cm).