456*68怎么估算?,如何使用计算器计算456与68的乘积
(1-0.2)*5.68+1.456 =0.8*5.68+1.456 =4.544+1.456 =6
估算可以转化成450x70
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(1-0.2)*5.68+1.456 =0.8*5.68+1.456 =4.544+1.456 =6
估算可以转化成450x70