Question

11．甲數(shù)是乙數(shù)的$\frac{4}{5}$，則乙數(shù)比甲數(shù)多25%．√．（判斷對錯）

Answer 1

分析 甲數(shù)是乙數(shù)的$\frac{4}{5}$，將乙數(shù)當(dāng)作單位“1”，根據(jù)分數(shù)減法的意義，甲數(shù)比乙數(shù)少1-$\frac{4}{5}$，根據(jù)分數(shù)的意義，乙數(shù)比甲數(shù)多（1-$\frac{4}{5}$）$÷\frac{4}{5}$．

解答 解：（1-$\frac{4}{5}$）$÷\frac{4}{5}$
=$\frac{1}{5}$$÷\frac{4}{5}$
=25%
即乙數(shù)比甲數(shù)多25%．
故答案為：√．

點評 完成本題要注意單位“1”的確定，單位“1”一般處于“比、是、占”后邊．