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7.8*1990+78简便计算怎么算?
人气:354 ℃ 时间:2019-12-27 00:36:02
解答
7.8 × 1990 + 78
= 7.8 × 1990 + 7.8 × 10
= 7.8 × (1990 + 10)
= 7.8 × 2000
= 15600
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