谁知道的,请告诉我?
第1个回答 2022-04-16
39×51-51-51×9
=51×(39-9)-51
=51×30-51
=1530-51
=1479
=51×(39-9)-51
=51×30-51
=1530-51
=1479
第2个回答 2022-04-16
39x51-51-51x9
=51ⅹ(39-1-9)
=51ⅹ29
=1530-51
=1479
=51ⅹ(39-1-9)
=51ⅹ29
=1530-51
=1479
第3个回答 2022-04-13
39×51-51-51×9
=(39-9)×51-51
=30×51-51
=1530-100+49
=1430+49
=1479本回答被网友采纳
=(39-9)×51-51
=30×51-51
=1530-100+49
=1430+49
=1479本回答被网友采纳
第4个回答 2022-04-12
39×51-51-51×9
【提取公因数51】
=51×(39-1-9)
=51×29
=(50+1)×(30-1)
=1500+30-50-1
=1479
【提取公因数51】
=51×(39-1-9)
=51×29
=(50+1)×(30-1)
=1500+30-50-1
=1479
第5个回答 2022-04-12
这道题应该这样计算,39*51-51-51*9=51*(39-9)-51=51*30-51=1530-51=1479