计算 ×10= × = 2+ = + = &nbs

1. 计算
$\text{[math]}$ ×10=        $\text{[math]}$ × $\text{[math]}$ =      2+ $\text{[math]}$ =

$\text{[math]}$ + $\text{[math]}$ =        $\text{[math]}$ ÷ $\text{[math]}$ =     7× $\text{[math]}$ =

$\text{[math]}$ - $\text{[math]}$ =         $\text{[math]}$ ÷ $\text{[math]}$ =   0.7÷0.2=