(1)(0.8-0.8×0.8)×0.8,
=(0.8-0.64)×0.8,
=0.16×0.8,
=0.128.
答:积是0.128.
(2)乙数:50÷(3-1),
=50÷2,
=25;
甲数:25+50=75;
答:甲数是75,乙数是25.