化简下列各数 -(-2.85 ) {-(3 又1/2)} +(-12) +{-(-7又1/8)

问题描述:

化简下列各数 -(-2.85 ) {-(3 又1/2)} +(-12) +{-(-7又1/8)

-(-2.85 ) {-(3 又1/2)} +(-12) +{-(-7又1/8)
=-2.85×3.5-12+7.125
=-9.975+7.125-12
=-2.85-12
=-14.85????这是有四个数,-(-2.85 ) {-(3 又1/2)} +(-12)+{-(-7又1/8)-(-2.85 ) =2.85{-(3 又1/2)} =-3又1/2+(-12)=-12+{-(-7又1/8)=7又1/8