( )÷3-15=4口算题怎么做

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( )÷3-15=4口算题怎么做
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( )÷3-15=4口算题怎么做
( )÷3-15=4口算题怎么做

( )÷3-15=4口算题怎么做
(57)÷3-15=4
( )=(4+15)×3=57

()/3=19
()=57

(4+15)*3=57