Children, do your homework on New Year's Day.

Wait a minute, I'll do it right away.

1.C

2.B

3.B

4.4,3

5. 145

6. (1) The rents for 60 seats and 45 seats are X and Y respectively.

x-y = 200； 4x+2y = 5000； The solution is x = 900y = 700.

(2)5x+y = 5 * 900+700 = 5200；

7. Set the starting price X and the fare per kilometer Y;

x+8 * y = 17； x+20 * y = 35； X=5，y = 1.5；

8.( 1) Let the number of men and women be x and y respectively.

x+y = 100；

0.6 * x+0.4 * y = 0.49 * 100；

The solution is x = 45y = 55.

(2) Because there are more boys than girls in B school, the excellent score rate of boys in B school is higher than that of girls in A school. ..

For example, the number of boys in school B is 90 and the number of girls is10;

The excellent rate of school B is 90 * 0.57+10 * 0.37 =100 * 0.55, that is, the excellent rate is 55%>；; 49%;

.9. Let the number of people in 10 yuan and 15 yuan be x and y respectively.

12+x+y+3 = 40； 5 * 12+ 10x+ 15y+20 * 3 = 400； X= 19，y = 6；

10. Set the number of brands A X and B Y..

In two cases (1), choose the model of brand B as D.

x+y = 36； 6000 x+5000y = 100000； X=-80，y = 1 16； unreasonable

(2) Select the model of brand B as E..

x+y = 36； 6000 x+2000y = 100000； X=7，y = 29

There are 7 A-type computers to buy immediately.

1 1 (1) bought x and y copies respectively.

x+y = 40； 5x+8y = 300-(68– 13)； X=25，y = 15；

(2) For 68 yuan, x=29.3, y =10.7; Unrealistic.

Seek Excellence and give points.