直接写得数. + = + = -

1. (2020五下·高密期末) 直接写得数.
$\text{[math]}$ + $\text{[math]}$ = $\text{[math]}$ + $\text{[math]}$ = $\text{[math]}$ - $\text{[math]}$ = $\text{[math]}$ + $\text{[math]}$ =

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

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1. (2020五下·高密期末) 直接写得数. + = + = - = + = - = - + = + + =