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phần 1 = 24 x (31+42+27)=24 x 100=2400
phần 2 = (36 x (28+82)) + (64 x (69+41)) = (36x110) + (64x110) = 110 x (36+64) = 110x100=11000
\(\left(2013.2014+2014.2015+2015.2016\right).\left(1+\frac{1}{3}-1-\frac{1}{3}\right)\)
\(=\left(2013.2014+2014.2015+2015.2016\right).0\)
= 0
a: \(=\left(15-6-\dfrac{13}{18}\right):\dfrac{298}{27}-\dfrac{17}{8}:\dfrac{51}{40}\)
\(=\dfrac{149}{18}\cdot\dfrac{27}{298}-\dfrac{5}{3}=\dfrac{3}{2}-\dfrac{5}{3}=\dfrac{9-10}{6}=\dfrac{-1}{6}\)
b: \(=\dfrac{-16}{5}\cdot\dfrac{-15}{64}+\dfrac{-22}{15}:\dfrac{11}{2}\)
\(=\dfrac{3}{4}-\dfrac{4}{15}=\dfrac{29}{60}\)
c: \(=\dfrac{-7}{9}\left(\dfrac{4}{11}+\dfrac{7}{11}\right)+5+\dfrac{7}{9}=\dfrac{-7}{9}+\dfrac{7}{9}+5=5\)
d: \(=\dfrac{1}{2}\cdot\dfrac{4}{3}\cdot10\cdot\dfrac{1}{5}\cdot\dfrac{3}{4}=1\)
e: \(=\dfrac{4}{25}+\dfrac{11}{2}\cdot\dfrac{5}{2}+\dfrac{-23}{4}=\dfrac{204}{25}\)
1/2 - (2/3x - 1/3) = 2/3
=> 1/2 - 2/3x + 1/3 = 2/3
=> 5/6 - 2/3x = 2/3
=> 2/3x = 5/6 - 2/3
=> 2/3x = 1/6
=> x = 1/6 : 2/3
=> x = 1/4
8x = 7,8x + 25
=> 8x - 7,8x = 25
=> 0,2x = 25
=> x = 25 : 0,2
=> x = 125
\(\frac{1}{2}-\left(\frac{2}{3}x-\frac{1}{3}\right)=\frac{2}{3}\)
\(\frac{1}{2}-\frac{2}{3}x+\frac{1}{3}=\frac{2}{3}\)
\(-\frac{2}{3}x=-\frac{1}{6}\)
\(x=\frac{1}{4}\)
\(8x=7,8x+25\)
\(02,x=25\)
\(x=125\)
=.= hk tốt!!
B= 1/1.2.3+1/2.3.4+....+1/48.49.50
B= 1/1.2-1/2.3+1/2.3-1/3.4+...+1/48.49-1/49.50
B = 1/1.2-1/49.50
B= 1/2-1/2450
B= 612/1225
a)Chịu
b)(68x8686 - 6868x86) xA = {[68x(86x101)] - [(68x101)x86]} xA =[(68x86x101) - (68x101x86)] xA = 0 xA = 0
a) 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
= ( 2 x 12 ) x 31 + 24 x 42 + ( 8 x 3 ) x 27
= 24 x 31 + 24 x 42 + 24 x 27
= 24 x ( 31 + 42 + 27 )
= 24 x 100
= 2400
b) ( 68 x 8686 - 6868 x 86) x ( 1 + 2 + 3 + ... + 2016 )
= ( 68 x 86 x 101 - 68 x 101 x 86 ) x ( 1 + 2 + 3 + ... + 2016 )
= 0 x ( 1 + 2 + 3 + ... +2016 )
= 0