直接写出得数 + = 75×20％= × = &n

1. 直接写出得数
$\text{[math]}$ + $\text{[math]}$ =        75×20％=       $\text{[math]}$ × $\text{[math]}$ =        $\text{[math]}$ × $\text{[math]}$ =
3.14×3=       $\text{[math]}$ ÷ $\text{[math]}$ =        15.7÷5=     20÷ $\text{[math]}$ =
$\text{[math]}$ - $\text{[math]}$ =       49÷ $\text{[math]}$ =      81× $\text{[math]}$ =       56× $\text{[math]}$ =
1- $\text{[math]}$ =          $\text{[math]}$ + $\text{[math]}$ =        84×50%=       $\text{[math]}$ ×40=