First one? Class One holds a mountaineering competition every five years. At the same time, Xiaoxiao climbed 7/8 of the whole course and climbed1112. Who climbs fast?

The second school held a skipping competition, and everyone was required to jump 100 times. Xiaohong took 3/4 minutes, Xiaoming took 5/3 minutes and Xiaodong took 8/5 minutes. Who jumps fast?

Then start answering questions:

Who boarded fast, that is, who boarded more distances in the same time, and the size ratio of 7/8 to112. 7/8= 1- 1/8, 1 1/ 12= 1- 1/ 12。 And1/8 >; 112 (the fraction with the same numerator and small denominator is large), so now1is used to subtract these two fractions, which is relatively large, and the remaining fraction after subtraction will be relatively small, so you can get 7/8.

Whoever jumps fast means jumping as many times, and spending less time means jumping fastest. The comparison is 3/4, 5/3 and 8/5. Because obviously, 3/4