谁知道的,请告诉我?
第1个回答 2022-04-09
39×51-51-51×9
=51×(39-1-9)
=51×29
=51×30-51
=1479
=51×(39-1-9)
=51×29
=51×30-51
=1479
第2个回答 2022-04-09
解:39×51-51-51×9
=51x(39-9)-51
=51x30-51
=1530-51
=1479。
=51x(39-9)-51
=51x30-51
=1530-51
=1479。
第3个回答 2022-04-09
解:39×51-51-51×9=39×51-51-9×51=39×51-9×51-51=(39-9)×51-51=30×51-(50+1)=1530-50-1=1480-1=1479
第4个回答 2022-04-08
39×51-51-51×9
=51×(39-9-1)
=51×(30-1)
=51×30-51×1
=1530-51
=1479
=51×(39-9-1)
=51×(30-1)
=51×30-51×1
=1530-51
=1479
第5个回答 2022-04-08
39×51−51−51×9
=39×51−51×1−51×9
=51×(39−1−9)
=51×29
=1479
=39×51−51×1−51×9
=51×(39−1−9)
=51×29
=1479