是个最简分数,X和Y的最大公因数是 ,最小公倍数是 .
= :24=0.625=20÷ = .
比的前项是0.4,比值是,则比的后项是 .
=0.75= ÷12=1.8: = :24.
=0.8==16÷( )=从左到右依次是 .
= ÷ = %= (填小数)