知识根据地 × = × =24 × = × =36 ÷ = ÷ =5 × = ÷ =81时= 分; 100分= 时 分;75秒= 分 秒.
= : =.
= %= : ═ (小数)
%=7÷8= (填小数).
13.5÷ ==0.45=18: = %
÷24=0.375=15: = :16= %