(1)14*(-1+5/7)(2)(-100)*(3/10-1/2+1/5-0.1)(3)9又18/19*(-5)

问题描述:

(1)14*(-1+5/7)
(2)(-100)*(3/10-1/2+1/5-0.1)(3)9又18/19*(-5)