3.(37.9-3.8*5)/0.9=2 1

4. let this number be x? 3x- 12. 12 divided by 2= 10.44.

3x-6.06= 10.44

? 3x= 16.5

x=5.5

5.(4.6- 1.2* 1.5)/3.5=0.8

6. Let B be X.

3.5x+x=5.4

4.5 times =5.4 times

x= 1.2？ A number = 1.2*3.5=4.2.

(2)

The topic is missing.

2800*( 1-0.85)=420 (yuan)

500/( 1+9)=50 ? Honey: 1*50=50? Water: 9*50=450

Lack of tax rate

One week: 70*3. 14=2 19.8(cm)? 200 cycles per minute: 219.8 * 200 = 43960 (cm) = 439.6m? 10 minute: 439.6* 10=4396 (m)

Solution: Let's do the right X way.

? 5x-2(20-x)=86

? 5x-40+2x=86

7x= 126

x= 18

5*85+(5- 1.5)*80=705 (m)

Solution: let's set table tennis X.

4x*2+8x=360

9. Basketball X Football (x- 10)

? 10x+5(x- 10)=700

10. water bottle x, teacup (6+x)

? 25x+6(6+x)= 160

1 1. car x, motorcycle (24-x)

? 4x+2(24-x)=86

Because of time, I just can't figure out the equation of 8- 1 1. In fact, the application problems of these equations are all of a nature. The final exam is coming, so we must master the most basic equations. I wish you good results in the final exam in a few days!