8 20
分析:根據(jù)“比乙數(shù)多
”可知把乙數(shù)看作單位“1”,那么可用10除以(1+
)得到乙數(shù)是多少;根據(jù)“乙數(shù)比甲數(shù)少”是把甲數(shù)看作單位“1”,可將甲數(shù)減去乙數(shù)的差再除以甲數(shù)即可得到乙數(shù)比甲數(shù)少百分之幾,列式解答即可得到答案.
解答:10÷(1+
)
=10÷
,
=8,
(10-8)÷10
=2÷10,
=0.2,
=20%,
答:乙數(shù)是8,乙數(shù)比甲數(shù)少20%.
故答案為:8,20.
點評:解答此題的關鍵是根據(jù)題干的敘述分別找準單位“1”(單位“1”發(fā)生了變化),然后再列式計算即可.