计算。5K;U4_:O6]8O9Y.^+p
如果△=2,○=3,□=5,那么5K;U4_:O6]8O9Y.^+p
□+○+△=2L0o.~5@'X-_0n9U:E1o5E,a6O1~5K;U4_:O6]8O9Y.^+p
△+○-□=2V'n'~+c/N/X4M8@;a5K;U4_:O6]8O9Y.^+p
△+△-○=;P)}(x(P1i5K;U4_:O6]8O9Y.^+p
□+□-□=*`-y9v+Z*t6o6Z+o/i/h5K;U4_:O6]8O9Y.^+p