直接写得数。

填空题未知容易

$\text{[math]}$ + $\text{[math]}$ = $\text{[math]}$ + $\text{[math]}$ = $\text{[math]}$ - $\text{[math]}$ = 1- $\text{[math]}$ =

$\text{[math]}$ - $\text{[math]}$ = 2- $\text{[math]}$ = $\text{[math]}$ + $\text{[math]}$ = 4.4+ $\text{[math]}$ =

2 $\text{[math]}$ + $\text{[math]}$ = 4-1 $\text{[math]}$ =

口算与估算常考题容易

解决问题未知容易

$\text{[math]}$ + $\text{[math]}$ =	$\text{[math]}$ + $\text{[math]}$ =	$\text{[math]}$ - $\text{[math]}$ =	2.4– $\text{[math]}$ =
1- $\text{[math]}$ =	$\text{[math]}$ - $\text{[math]}$ =	1- $\text{[math]}$ - $\text{[math]}$ =	$\text{[math]}$ + $\text{[math]}$ + $\text{[math]}$ =