第1个回答 2021-05-26
51x100-51
第2个回答 2021-05-27
51x99
=51x(100-1)
=51x100-51x1
=5100-51
=5049
第3个回答 2021-05-27
51x99
=51x(100-1)
=51x100-51x1
=5100-51
=5049
第4个回答 2021-05-27
=51×(100-1)
=51×100-51=5049
第5个回答 2021-05-26
51X99
=51(100-1)
=51X100-1X51
=5100-51
=5049