2.5+7.5×(3.64-1.24) 简便计算
人气：360 ℃ 时间：2020-04-26 07:26:56
解答
2.5+7.5×(3.64-1.24)
=2.5+7.5×2.5
=2.5×(1+7.5)
=2.5×(8+0.5）
=2.5 ×8+2.5×0.5
=20+1.25
=21.25
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