TÍNH NHANH
a) 66.36+63.65-63
b) 57.36+57.63+60
c) 35.48+35.50+72
d) 15.66+30.17
e)45.56+15.32
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\(a.-\dfrac{8}{12}=\dfrac{-2\cdot4}{4\cdot3}=-\dfrac{2}{3}\)
\(b.\dfrac{15}{-60}=\dfrac{15}{15\cdot-4}-\dfrac{1}{4}\)
\(c.\dfrac{-16}{-72}=\dfrac{-2\cdot8}{-9\cdot8}=\dfrac{2}{9}\)
\(d.\dfrac{35}{14\cdot15}=\dfrac{7\cdot5}{7\cdot2\cdot5\cdot3}=\dfrac{1}{6}\)
\(\dfrac{8}{12}\)=\(\dfrac{2}{31}\)
\(\dfrac{15}{-60}\)=\(\dfrac{-1}{4}\)
\(\dfrac{-16}{72}\)=\(\dfrac{-2}{9}\)
\(\dfrac{35}{14.15}=\dfrac{35}{210}=\dfrac{1}{6}\)
\(a,=\left(73-27\right)\left(73^2+73\cdot27+27^2\right)=46\cdot8029=369334\\ b,=\left(63-27\right)\left(63+27\right)+\left(72-18\right)\left(72+18\right)\\ =100\cdot36+54\cdot100=100\left(36+54\right)=100\cdot90=9000\\ c,=\left(105-5\right)^3=100^3=1000000\)
18.15 + 35 + 15.32 + 35.49 = 15.(18+32) + 35.(1+49) = 15.50 + 35.50 = 50.(15+35) = 50.50 = 2500
35.48 + 65.68 + 20.35
= 35.(48 + 20) + 65.68
= 35.68 + 65.68
= (35 + 65).68
= 100 . 68
= 6800
35.48+65.68+20.35
=35.48+20.35+65.68
=35.(48+20)+65.68
=35.68+65.68
=68.(35+65)
=68.100=6800
a)66.36+66.65-63
=66.(36+65-1)
=66.100
=6600
b)57.36+57.63+60
=57.(36+57)+60
=57.93+60
=5301+60
=5361
c)35.(48+50)+72
=35.98+72
=3430+72
=3502
d)15.66+30.17
=15.66+15.2.17
=15.66+15.34
=15.(66+34)
=15.100
=1500
e)45.56+15.32
=15.3.56+15.32
=15.168+15.32
=15.(168+32)
=15.200
=3000
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