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.