12.8-0.5×0.5-0.75等于?用简便方法计算.
人气:158 ℃ 时间:2019-12-07 10:33:01
解答
12.8-0.5×0.5-0.75
=12.8-0.25-0.75
=12.8-(0.25+0.75)
=12.8-1
=11.8
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