1) 273+(−321)−5149=2146−3147−5149=−1141−5149=−61410=−675;
2) 492−5181−(−165)+(−32)=4184−5181+11815−1812=
=(4184+11815)−(5181+1812)=6181−51813=51819−51813=186=31;
3) −321+4,8−8,7−(−551)=−3,5+4,8−8,7+5,2=
=(4,8+5,2)−(3,5+8,7)=10−12,2=−2,2;
4) 7,8−941−4107−(−3,4)=7,8−9,25−4,7+3,4=
=(7,8+3,4)−(9,25+4,7)=11,2−13,95=−2,75.