Solution on page 107: Suppose this dress is worth X silver coins. According to the meaning of the question, it is: (x+2) ÷ x+2) ÷ 7 = (x+10) ÷12+02. Get x = 9.2 A: This dress is worth 9.2 silver coins. 4. solution: suppose the price of this commodity is x yuan per piece. According to the question, it means 90% x-250 = 250× 15.2%. A: The price of this commodity is 320 yuan per piece. 5. Solution: Assuming that there are x products in each box, according to the meaning of the problem, we get: (8x+4) ÷ 5 = (11x+1) ÷ 7+1,and we get x =/kloc-. A: Each kind. 6. Solution: Let the speed of the two cars be equal after X hours, that is, the speed is (30+20x) km/h/h. According to the meaning of the question, it means: 30+20x = 90- 10x. The solution is X = 2, 30+20x = 30+20× 2 = 70. A: after two hours, the speed of the two cars is equal, with a speed of 70km/h 7. Note: All solutions are based on per capita quota1.4x+20/4 = 6x-20/52.4a+20/4 = 6a-20/5+23.4y+20/4 = 6y-20/5-28. (1). According to the meaning of the question, we get: 5x+5 (x+20)+5 (x+20-10) =1262, x≈74, then x+20 ≈ 74+20 = 94 (. (2) The driving distance within 8 hours is 74×5+94×3=652 (km), and half of the whole journey is 1262÷2=63 1 (km). The distance covered in 8 hours is 2 1 km, which is more than half of the whole journey. According to the map, the car was in the section from Jinan to Linyi of the expressway after 8 hours of departure. 9. Solution: Let his life span be X, and the equation should be X = (1/6) x+(112) x+(1/7) x+(1/2) x+. (3) When his son died, Diophantu was 80 years old. I'm also a junior. I typed these words word by word. Trust me, it's absolutely right. Adopt me ~ ~ ~! !