直按写得数720÷12= × =1﹣ ﹣ =0.9×101﹣0.9= ﹣ = + =（ + ）×56= × ÷ × =

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720÷12=	$\text{[math]}$ × $\text{[math]}$ =	1﹣ $\text{[math]}$ ﹣ $\text{[math]}$ =	0.9×101﹣0.9=
$\text{[math]}$ ﹣ $\text{[math]}$ =	$\text{[math]}$ + $\text{[math]}$ =	（ $\text{[math]}$ + $\text{[math]}$ ）×56=	$\text{[math]}$ × $\text{[math]}$ ÷ $\text{[math]}$ × $\text{[math]}$ =

1. 直按写得数720÷12= × =1﹣ ﹣ =0.9×101﹣0.9= ﹣ = + =（ + ）×56= × ÷ × =