Find the answer to the through train at the end of the seventh grade of Mathematics Weekly People's Education Edition

A 1。 B 2。 D 3。 B 4。 B 5。 A six. B 7。 B 8。 C

2. 1.y=5x-6/3，x=3y=6/5。

2. The answer is not one.

3.246

4.x= 16 y= 1，x= 12 y=2，x=8 y=3，x=3 y=3

5.2

6.2,-2

7.- 10/7

8.2 times = 3 years

Three. 1.( 1) x = 23，y = 12。

(2)x=48，y= 1 1

2. There are 48 five-character quatrains and 35 seven-character quatrains.

There are 28 basketball teams and 20 volleyball teams.

4. Year 20 1 1

(B 1)

A 1。 D

2.A

II 1。 -3, 10/3

2.(20x/ 1+0. 15)-(y/ 1-0. 1)= 500

x-y=950

Three1.4x+3y+252 *1=112.

( 1/2 * x+ 1/3 * y+ 1/4 * 252 = 168

2.( 1)49 yuan

(2) Buy 28kg for the first time and 42kg for the second time.

(B2)

1. 17 glass bottle is damaged.

2. Scheme 1: 630,000 yuan;

Option 2: 725,000 yuan;

Option 3: 8 10000 yuan;

Therefore, the third scheme is selected, with finishing 10 days and rough machining for 5 days.