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数学
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50/49*15+15/49*48用简便方法计算
人气:190 ℃ 时间:2019-12-22 12:14:21
解答
50/49×15+15/49×48
=15/49×50+15/49×48
=15/49×(50+48)
=15/49×98
=30
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