计算。6I7{(y-g3x'^;w.V;Y'~/|7h1l0?
如果△=2,○=3,□=5,那么6I7{(y-g3x'^;w.V;Y'~/|7h1l0?
□+○+△=5I1n8K7@-k.A2g;`6]0H,{6I7{(y-g3x'^;w.V;Y'~/|7h1l0?
△+○-□=(R;X:E/N+E/l7s4B1@;i6I7{(y-g3x'^;w.V;Y'~/|7h1l0?
△+△-○=)`8O5]1V/e5a6I7{(y-g3x'^;w.V;Y'~/|7h1l0?
□+□-□=8e:@9~1M*n(z.Q8j:M.p6I7{(y-g3x'^;w.V;Y'~/|7h1l0?