用1、2、3、4四个数字组成两个两位数,这两个两位数的乘积最大是 ,最小是 .
12: == :4=0.25= 折.
=2: =4÷ = %=0.2.
12÷ = :12=0.75= = %
0.75=6÷ = :12== %
1.75=7÷ ==28÷ =.