Figure 1:

1、 40 1

2、 -3/2

3.A

4、 14

5、 17

6、 4

Figures 2 and 3:

1、D

2、C

3、B

Figure 4:

1、 12/7

2、72

3、2

4、30; 40

Select:

1、A

2、D

3. A.

Figure 5:

1、78.9

2、20

3、35

4、9; 5; eight

choose

1、B

2、C

3、C

Figure 6:

1, assuming that the purchase price of goods is X and the sales volume in the first month is Y, then

1.2xy-xy=6000 ①

1. 1x( 100+y)-x( 100+y)= 6000+2000②

X=500，y=600。

The immediate purchase price was 500 yuan, and the sales volume in the second month was 700 pieces.

2. The linear function y=kx+b passes through (2,0), (0,2),

Its analytical formula is y=x-2.

Furthermore, the c coordinate is (2+√2, √2).

The inverse ratio resolution function is y = (2+2 √ 2)/x.