giúp mik với ạ ------------------------------------------

Bài 1: Tính nhanh

$a, 58.75+58.50-58.25$
$=58.(75+50-25)$

$=58.100$
$=5800$

$b, 27.39+27.63-2.27$

$=27.(39+63-2)$
$=27.100$
$=2700$

$c, 128.46+128.32+128.22$

$=128.(46+32+22)$
$=128.100$
$=12800$
$d, 66.25+5.66+66.14+33.66$
$=66.(25+5+14+33)$
$=66.77$

$=5082$

$e, 12.35+35.182-35.94$
$=35(12+182-94)$
$=35.100$

$=3500$

$f, 35.23+35.41+64.65$
$=35(23+41)+64.65$
$=35.64+64.65$
$=64(35+65)$

$=64.100$
$=6400$