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在括号里填上适当的 数
( )-3=9 ( )+7=11
( )+8=12 ( )-14=5
6+7=( )+8 19-8=( )+5
13=5+( )=6+( )=7+ ( )
17=3+ ( )=5+( )=9+ ( )
( )+10=57 ( )+50=80
4+ ( )=74 39- ( )=6
5+( )=48 ( )+30=65
4+ ( )=54 ( )+61=65
( )-20=7 ( )+30=57
( )+20=80 39- ( )=9
6+( )=48 45+( )=55
( )+20=63 5+( )=75
( )-5=90 ( )-16=30
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