若角a,b满足-90

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若角a,b满足-90若角a,b满足-90若角a,b满足-90-180-90加起来

若角a,b满足-90
若角a,b满足-90

若角a,b满足-90
-180 -90 加起来

若角a,b满足-90 若角A,B满足-π/2 若角A、B满足-π/2 若角A、B满足-π/2 若角a,b满足-∏/2 若角a,b满足-派/2 若角a,b满足-π/2 若角a,b满足-π/2 若角A、B满足-π/2 若角A、B满足-π/2 若角A,B满足-π/2 若角A、B满足-π/2 a,b满足0 a,b满足0 实数a,b满足0 角a,b满足0 实数a,b满足0 实数a.b满足-1