\(86,72+9,8-12,73+10,2-7,27\)
\(\text{=}86,72+\left(9,8+10,2\right)-\left(12,73+7,27\right)\)
\(\text{=}86,72+20-20\)
\(\text{=}86,72+\left(20-20\right)\)
\(\text{=}86,72\)
86,72 + 9,8 - 12,73 + 10,2 - 7,27
= 86,72 - ( 9,8 + 10,2) - ( 12,73 + 7,27 )
= 86,72 - 20 - 20
= 46 , 72