a. −310 - 0,125 + −710 + 1,125
= (−310+−710)+(1,125−0,125)
= -1 + 1 = 0
b. −83 . 211 - 83 : 119
= 83.−211−83.911
= 83.(−211−911)
= 83.(−1)=−83