直接写得数 ﹣ = + = ﹣ = + =6.9÷23= ﹣ =1+ = + = ﹣1=0.4÷5=

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$\text{[math]}$ ﹣ $\text{[math]}$ =	$\text{[math]}$ + $\text{[math]}$ =	$\text{[math]}$ ﹣ $\text{[math]}$ =	$\text{[math]}$ + $\text{[math]}$ =	6.9÷23=
$\text{[math]}$ ﹣ $\text{[math]}$ =	1+ $\text{[math]}$ =	$\text{[math]}$ + $\text{[math]}$ =	$\text{[math]}$ ﹣1=	0.4÷5=

1. 直接写得数 ﹣ = + = ﹣ = + =6.9÷23= ﹣ =1+ = + = ﹣1=0.4÷5=