a) \(146.53+146.48-146\)
\(=146\left(53+48-1\right)\)
\(=146.100\)
\(=14600\)
b) \(13.27+18.\left(-27\right)+105.27\)
\(=13.27+\left(-18\right).27+105.27\)
\(=27\left[13+\left(-18\right)+105\right]\)
\(=27.100\)
\(=2700\)
c) \(-124-\left(-564-24\right)-364\)
\(=-124-564+24-364\)
\(=-124+\left(-564\right)+24+\left(-364\right)\)
\(=\left[\left(-124\right)+24\right]+\left[\left(-564\right)+\left(-364\right)\right]\)
\(=\left(-100\right)+\left(-200\right)=-300\)
d) \(\left(1324+987-456\right)-\left(324-13\right)+556\)
\(=1324+987-456-324+13+556\)
\(=1324+987+\left(-456\right)+\left(-324\right)+13+556\)
\(=\left[1324+\left(-324\right)\right]+\left[987+13\right]+\left[\left(-456\right)+556\right]\)
\(=1000+1000+100=2100\)
e) \(2-4+6-8+...........-2008+2010\) (860 số hạng)
\(=\left(2-4+6-8\right)+\left(10-12+14-16\right)+...........+\left(2002-2004+2006-2008\right)\)(215 nhóm)
\(=0+0+......+0=0\)
f) \(36.28+36.82+64.69+64.41\)
\(=36\left(28+82\right)+64\left(69+41\right)\)
\(=36.110+64.110\)
\(=110\left(36+64\right)\)
\(=110.100=11000\)
g) \(35.34+35.86+65.75+65.45\)
\(=35\left(34+86\right)+65\left(75+45\right)\)
\(=35.1200+65.1200\)
\(=1200\left(35+65\right)\)
\(=1200.100=120000\)
