(69.9-4.74-5.16)*6.5怎么简便计算

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(69.9-4.74-5.16)*6.5怎么简便计算
(69.9-4.74-5.16)*6.5怎么简便计算

(69.9-4.74-5.16)*6.5怎么简便计算
(69.9-4.74-5.16)*6.5
=(69.9-(4.74+5.16))*6.5
=(69.9-9.9)*6.5
=60*6.5
=60*6+60*0.5
=360+30
=390

=[69.9-(4.74+5.16)]*6.5
=(69.9-9.9)*6.5
=60*6.5
=390