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6.9×7.99+0.69×20.1简便方法
人气:300 ℃ 时间:2020-04-14 04:02:38
解答
6.9×7.99+0.69×20.1
=6.9×7.99+6.9×2.01
=6.9x(7.99+2.01)
=6.9x10
=69
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