直接写出下列各题的得数。 1.5÷0.8= 5- = 75÷ = 0.25+ = 3.2×10%= 36× =

解决问题未知容易

21× $\text{[math]}$ =	$\text{[math]}$ ÷3=	$\text{[math]}$ =	$\text{[math]}$ =
$\text{[math]}$ =	0× $\text{[math]}$ =	$\text{[math]}$ =	4× $\text{[math]}$ +4× $\text{[math]}$ =

口算与估算未知容易

$\text{[math]}$ × $\text{[math]}$ ＝	$\text{[math]}$ × $\text{[math]}$ ＝	3÷ $\text{[math]}$ ＝	$\text{[math]}$ × $\text{[math]}$ ＝	$\text{[math]}$ ÷ 3＝
$\text{[math]}$ =	$\text{[math]}$	$\text{[math]}$	0.48× $\text{[math]}$ =	$\text{[math]}$ × $\text{[math]}$ ÷ $\text{[math]}$ × $\text{[math]}$ ＝