如果(a,b都是小于10而大于1的自然数),那么10﹣a<10﹣b. .(判断对错)
: ==12: = %
:16=9: =0.75= %
10: =4÷8== %= 成.
1= ÷10=24: = %= [填小数].
12÷ = :20==0.8= %