题目肯定发错了 ,应该是0.23乘5分之3乘(-1)的3次方-19乘3分之2-3分之1乘19乘(-1)的四次方-0.23乘5分之2
解:
0.23×3/5×(-1)^3 - 19×2/3 -1/3×19×(-1)^4 - 0.23×2/5
=[0.23×3/5×(-1)^3 - 0.23×2/5]- [19×2/3 +1/3×19×(-1)^4]
=( -0.23×3/5 - 0.23×2/5) - (19×2/3 +1/3×19)
= -0.23×(3/5+2/5) - 19×(2/3+1/3)
= -0.23×1 -19
= -0.23 -19
= -19.23
你题目有没有发错啊?