9 7=7 ( )=19-( )=15 ( )=10 ( )这题怎么算

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97=7()=19-()=15()=10()这题怎么算97=7()=19-()=15()=10()这题怎么算97=7()=19-()=15()=10()这题怎么算97=7(+90)=19-(-71)=

9 7=7 ( )=19-( )=15 ( )=10 ( )这题怎么算
9 7=7 ( )=19-( )=15 ( )=10 ( )这题怎么算

9 7=7 ( )=19-( )=15 ( )=10 ( )这题怎么算
97=7(+90)=19-(-71)=15(+82)=10(+72)