34.5×76.5－345×6.42=34.5×76.5－34.5×64.2=34.5×12.3
34.5×12.3－123×1.45=34.5×12.3－12.3×14.5=12.3×20=246
34.5×76.5×－345×6.42－123×1.45 要简算
34.5×76.5×－345×6.42－123×1.45 要简算
数学人气：129 ℃时间：2020-03-27 19:41:58
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