(1)(2.4-0.8)×
3
4 ,
=1.6×
=1.2;
答:积是1.2.
(2)设这个数为x,由题意得:
5 x-40%x=16,
0.6x-0.4x=16,
0.2x=16,
x=80;
答:这个数是80.