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