(99+17/18)×9的简便运算
人气:318 ℃ 时间:2020-01-10 02:48:08
解答
(99+17/18)×9
=(100-1+17/18) ×9
=100×9-1×9+17/18×9
=900-9+8.5
=900-9+9-0.5
=899.5
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