1. Solve the equation.

3x+5=20

x=5

3.5x- 1.5x= 10.8

x=5.4

5x- 1.2=6.8

x= 1.6

4x+8x=36

x=3

2. Students collected waste batteries, and Class Six (1) collected 128, 8 more than Class Six (2) collected three times. How many waste batteries did Class Six (2) collect?

Solution: 62-stage collection of X pieces of waste batteries.

3x+8= 128

x=40

3. Solution: Let the bottom of this triangular vegetable field be x meters.

40x/2=80

x=4

4. Solution: Suppose Teacher Zhang bought X sets of clothes.

68x+52x=960

x=8

10.

1.2x+3.9x=7.2

x≈0.89

9y-4y=30

y=6

5x- 16=48

x= 12.8

2. Solution: Assume that the average daily consumption of rice is X kilograms.

18x+ 120= 1020

x=50

3. Solution: Let X meet two cars when he was a child.

90x+65x=465

x=3

4. solution: let the width be x meters.

( 190+x)*2=640

x= 130

5. solution: let the number in the box be X.

24x+30x=32.4

x=0.6

1 1.

1.6,12,8, exactly the same, equal length, exactly equal, equal length.

2.4,4,4,68

3.5

4. 15,20, 12, 16

5.2,2,3,3,2,2