口算 ÷ =2.1× =100﹣11.9=3﹣ =0.875﹣ = + =1﹣ ÷ = + × =0.36+0.2= ÷3× ÷3=

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$\text{[math]}$ ÷ $\text{[math]}$ =	2.1× $\text{[math]}$ =	100﹣11.9=	3﹣ $\text{[math]}$ =	0.875﹣ $\text{[math]}$ =
$\text{[math]}$ + $\text{[math]}$ =	1﹣ $\text{[math]}$ ÷ $\text{[math]}$ =	$\text{[math]}$ + $\text{[math]}$ × $\text{[math]}$ =	0.36+0.2=	$\text{[math]}$ ÷3× $\text{[math]}$ ÷3=

1. 口算 ÷ =2.1× =100﹣11.9=3﹣ =0.875﹣ = + =1﹣ ÷ = + × =0.36+0.2= ÷3× ÷3=