417-18-88简便计算

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417-18-88简便计算417-18-88简便计算417-18-88简便计算417-18-88=400+(17-18)-88=400-89=311=417-(18+88)=417-106=311

417-18-88简便计算
417-18-88简便计算

417-18-88简便计算
417-18-88
=400+(17-18)-88
=400-89
=311

=417-(18+88)
=417-106
=311