1.D 2。 B 3。 C 4 explosive D 5。 A six. B 7。 B 8。 B
9.x = 5； x = 32x=45
10.
1 1. solution: if there are x girls, there are (2x- 15) boys, which can be obtained according to the meaning of the question.
X+(2x- 15)=48 solution: x=2 1, then 2x- 15=27. A: 27 boys and 2 girls1.
12. Solution: Suppose A walked from place A to place B for x hours, then A walked 10xkm and B walked 6xkm.
According to the meaning of the question, 10x-6x=8 and x=2, then 10x=20(km) A: A walked for 2 hours, and the distance between A and B was 20km.
13. solution: let the purchase price of each handicraft be x yuan and the price tag be (x+45) yuan. According to the meaning of the question, it is concluded that.
The solution of 8× [85% (x+45)-x] =12× (45-35) is x = 155 and x+45 = 200.
Therefore, the purchase price of each piece of this handicraft is 155 yuan, and the price is 200 yuan.
14. Solution: Let the wholesale tomato be xkg and the wholesale beans be (40-x)kg.
According to the meaning of the question: 1.2x? 1.6(40? x)？ 60, x= 10, then 40-x=30.
Earning money:10 (1.8-1.2)+30 (2.5-1.6) = 6+27 = 33 (yuan)
He can earn money in 33 yuan by selling these tomatoes and beans that day.
Step 2: Select a job
15. solution: let the total number of parts to be processed be x, and get it according to the meaning of the question.
X+20x- 10240=20。 Solve this equation and get x=240. Processing days: =5 (days).
Answer: It is stipulated that the number of processed pieces is 240, and the planned processing days are 5 days.
16.( 1) Under normal circumstances, both parties can complete this contract.
(2) It is more appropriate to transfer A. ..
According to (1), if two people cooperate 12 days to complete the task, 75% of the task will be completed in 9 days, so there are still 6 days left for another person to complete the task alone. But 7.5 & gt6,5 & lt6 means that A can't finish the task, but B can. Therefore, it is more appropriate to transfer armor.