a)=(21,54+3,46)+(13,25+14,75)-(4,15+0,85)
= 25 + 28 - 5
= 25 - 5 + 28
= 20 + 28
= 48
=(13,25+14,75)+(21,54+3,46)+(-4,15-0,85)
=28+25+(-5)
=53+(-5)
=48
Cả câu b và c các bạn ơi
b)=(2014,43+5,57)+(1,32+4,23)-(24,23+11,32)
= 2020 + (5,55 - 35,55)
= 2020 + (-30)
= 1990
c)=(38,25-11,25)+(9,93+0,07)+(21,64-11,64)
= 27 + 10 + 10
= 47
Xong rồi đó.
\(13,25+21,54-4,15+14,75+3,46-0,85\)
\(=\left(21,54+3,46\right)-\left(4,15+0,85\right)+\left(13,25+14,75\right)\)
\(=25-5+28\)
\(=48\)
\(2014,43-24,23+1,32+5,57+4,23-11,32\)
\(=\left(2014,43+5,57\right)+\left(11,32-1,32\right)+\left(24,23-4,23\right)\)
\(=2020+10+20\)
\(=2050\)
\(38,25+0,07+21,64-18,25-11,64+9,93\)
\(=\left(38,25-18,25\right)+\left(9,93+0,07\right)+\left(21,64-11,64\right)\)
\(=20+10+20\)
\(50\)