The second chapter of mathematics in the first volume of the first day of junior high school urgently needs rational numbers and their operation review questions

1, he can just return to the starting point after completing the above training. If you are Xiaoming, can you understand the reason why the master said the result?

A: Because all positive numbers and negative numbers add up to zero, just going back to the starting point.

2. If the fuel consumption of the car is 0.3 liters/km, how many liters is the fuel consumption of Xiaoming in this training?

A: Positive and negative numbers are not considered at this time. Just add the absolute values and multiply them by 0.3, and the result is 0.3x 134=40.2.

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