底是3cm,高是0.2dm的平行四边形面积是0.6cm2. .(判断对错)
1.75=7÷ = =28÷ = .
: =2= ÷10= %
= ÷ === 0.41 (填小数)
:16= .
3÷ =75%= :24= (填小数).