0.23乘以5分之3乘以负一的3次方减去19乘以负一的4次方减0.23乘以5分之2的简便方法

问题描述:

0.23乘以5分之3乘以负一的3次方减去19乘以负一的4次方减0.23乘以5分之2的简便方法

0.23×3/5×(-1)3-19×(-1)4-0.23×2/5
=-0.23×(3/5+2/5)-19
=-0.23-19
=-19.23