口算． × = ×12= ÷ =20÷ =16×75%= + =3﹣ = ÷ = ×17= × ÷ × =

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$\text{[math]}$ × $\text{[math]}$ =	$\text{[math]}$ ×12=	$\text{[math]}$ ÷ $\text{[math]}$ =	20÷ $\text{[math]}$ =	16×75%=
$\text{[math]}$ + $\text{[math]}$ =	3﹣ $\text{[math]}$ =	$\text{[math]}$ ÷ $\text{[math]}$ =	$\text{[math]}$ ×17=	$\text{[math]}$ × $\text{[math]}$ ÷ $\text{[math]}$ × $\text{[math]}$ =

1. 口算． × = ×12= ÷ =20÷ =16×75%= + =3﹣ = ÷ = ×17= × ÷ × =