在5个3中间适当加进“+”,“—”,“×”,“÷”或( ),使下列等式成立:
3( )3( )3( )3( )3=1
3( )3( )3( )3( )3=2
3( )3( )3( )3( )3=3
3( )3( )3( )3( )3=4
在5个3中间适当加进“+”,“—”,“×”,“÷”或( ),使下列等式成立:
3( )3( )3( )3( )3=1
3( )3( )3( )3( )3=2
3( )3( )3( )3( )3=3
3( )3( )3( )3( )3=4
3()3()3()3()3=1
3()3()3()3()3=1
(1)× - - ÷
(2)+ ÷ × ÷
(3)× ÷ ÷ ×
(4)÷ + × ÷