口算。 + = - = 10× = ÷4=

1. (2021五下·义乌期末) 口算。
$\text{[math]}$ + $\text{[math]}$ = $\text{[math]}$ - $\text{[math]}$ = 10× $\text{[math]}$ = $\text{[math]}$ ÷4=

$\text{[math]}$ ÷ $\text{[math]}$ = 4.5× $\text{[math]}$ = 10- $\text{[math]}$ = 0.8÷ $\text{[math]}$ =

35× $\text{[math]}$ = 1.2+ $\text{[math]}$ = $\text{[math]}$ -0.1= 1- $\text{[math]}$ -0.7=