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a, 5/-14. 7/-19=8/38
b, -15/4 .( 16/-25 )=12/5
c, 3/-10 .( -15/-2 )=
d, -5/7 . ( 21/-10 )=-9/4
e, 10/-3. (6/-5)==4
f, 21/-9 . ( -6/14 )=1
g, -10/9 . ( 36/20 )=-2
s: \(=125\cdot100-25\cdot192\)
\(=12500-4800\)
=7700
a) \(3^3.38+3.41+3^3.21\)
\(=3\left(3^2.38+41+3^2.21\right)\)
\(=3\left(342+41+189\right)\)
\(=3.527=1716\)
b) \(69.75+25.69-68.10^2\)
\(=69\left(75+25\right)-68.100\)
\(=69.100+68.100\)
\(=100\left(68+69\right)\)
\(=100.137=13700\)
c) \(5^9:5^7+3^{15}:3^{14}\)
\(=5^2+3\)
\(=25+3=28\)
d) \(2^3.17+2^3.39+2^3.24+2^3.20\)
\(=2^3.\left(17+39+24+20\right)\)
\(=8.100=800\)
a: \(\dfrac{A}{B}=\dfrac{3.4\cdot10^{-8}}{3.4\cdot10^{-9}}=\dfrac{1}{10^8}:\dfrac{1}{10^9}=10\)
=>A gấp 10 lần B
b: \(\dfrac{A}{B}=\dfrac{10^{-4}+10^{-3}+10^{-2}}{10^{-9}}=\dfrac{10^{-2}\cdot\left(10^{-2}+10^{-1}+1\right)}{10^{-9}}=\dfrac{1}{10^7}\cdot\dfrac{111}{100}=\dfrac{111}{10^9}\)
=>A bằng 111/109 lần B
1)2345 - 1000 : [19 - 2(21 - 18)2]
=2345 - 1000 : [19 - 2 . 32]
=2345 - 1000 : 1
=2345 - 1000
=1345
\(3,4.\frac{-15}{68}+\left(0,8-\frac{21}{10}\right):\frac{10}{3}\)
= \(\frac{-3}{4}+\frac{-13}{10}:\frac{10}{3}\)
= \(\frac{-3}{4}+\frac{-39}{100}\)
= \(\frac{-57}{50}\)