看谁算得又对又快． + = - = 4- =

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1. (2019五下·英山期末) 看谁算得又对又快．
$\text{[math]}$ + $\text{[math]}$ = $\text{[math]}$ - $\text{[math]}$ = 4- $\text{[math]}$ = $\text{[math]}$ + $\text{[math]}$ =
1- $\text{[math]}$ = 0.5+ $\text{[math]}$ = 1- $\text{[math]}$ - $\text{[math]}$ = $\text{[math]}$ + $\text{[math]}$ =
$\text{[math]}$ + $\text{[math]}$ = $\text{[math]}$ - $\text{[math]}$ + $\text{[math]}$ = $\text{[math]}$ - $\text{[math]}$ = $\text{[math]}$ + $\text{[math]}$ - $\text{[math]}$ + $\text{[math]}$ =

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