第1个回答 2021-07-26
把98分解成100-2
205×(100-2)
=205×100-205×2
=20500-410
=2090
第2个回答 2021-07-26
=205×(100-2)
=205×100-205×2
=20500-410
=20090
第3个回答 2021-07-26
205×98
=205×(100-2)
=20500-410
=20090
第4个回答 2021-07-26
=205×(100-2)
=205×100-205×2
=20500-410
=20090
第5个回答 2021-07-25
205×98
=205×(100-2)
=205×100-205×2
=20500-410
=20090