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病例1:一根绳子长24米,第一次用去14,第二次用去41米,还剩下多少米?错解(1):12-14-14=1112(米)错解(2):12×(1-14-14)=6(米)诊断:这两种做法错误的原因都是未弄清“41”与“41米”的实际含义。
Case 1: A rope length of 24 meters, the first to go to 14, the second to go to 41 meters, how many meters left? Misunderstanding (1): 12-14-14 = 1112 (m) 2): 12 × (1-14-14) = 6 (m) Diagnosis: The reason for these two mistakes is that they do not understand the actual meaning of “41” and “41m”.