19.99加9.99乘9.99用简便方法运算求解

2025-06-22 03:38:47
推荐回答(1个)
回答1:

=(20-0.01)+(10-0.01)×(10-0.01)
=20-0.01+100-0.2+0.0001
=120-0.21+0.0001
=199.7901