(x- 1)+x+(x+ 1)= 135
The solution is x=45.
That is, the natural number in the middle is 45, so the former number is 44 and the latter number is 46.
A: These three adjacent natural numbers are 44, 45 and 46 respectively.
2. solution: let the speed of b car be x km/h, and establish the equation according to the meaning of the question.
(x+60)*2.5=360-35
The solution is x=70.
That is, the speed of car B is 70 km/h.
If you consider the situation after the meeting, you can do this. )
Let the speed of B car be ykm/h, and establish the equation according to the meaning of the question.
(x+60)*2.5=360+35
The solution is x=98.
That is, the speed of car B is 98 km/h.
(The word "Hui" in the title is still 70km/h)
3. Solution: Assuming that car B can catch up with car A within x hours, the equation is established according to the meaning of the question.
(80-60)*x=60*2
The solution is x=6.
A: The B car can catch up with the A car in six hours.
4. solution: let their original price be x yuan, and establish the equation according to the meaning of the question.
0.5 x+0.6 x = 990
The solution is x=900.
A: Their original price is 900 yuan.