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\(=\dfrac{\dfrac{1}{3}-\dfrac{1}{7}-\dfrac{1}{13}}{2.\left(\dfrac{1}{3}-\dfrac{1}{7}-\dfrac{1}{13}\right)}.\dfrac{3.\left(\dfrac{1}{4}-\dfrac{1}{16}-\dfrac{1}{64}-\dfrac{1}{264}\right)}{\dfrac{1}{4}-\dfrac{1}{16}-\dfrac{1}{64}-\dfrac{1}{264}}\)
\(=\dfrac{1}{2}.3=\dfrac{3}{2}\)
a. \(69+\left(26-3x\right):5=64\)
\(\left(26-3x\right):5=64+60=124\)
\(\left(26-3x\right)=64:5=\dfrac{64}{5}\)
\(3x=26-\dfrac{64}{5}=\dfrac{66}{5}\)
\(x=\dfrac{66}{5}:3=\dfrac{22}{5}\)
Vậy...
b. \(1236-\left(4x-124\right)=4^4.4^{15}:4^{16}+2^3\)
\(1236-\left(4x-124\right)=64+8=72\)
\(\left(4x-124\right)=1236-72=1164\)
\(4x=1164+124=1288\)
\(x=1288:4=322\)
Vậy...
c. \(3^x:3^5=81.3^6\)
\(3^x:3^5=59049=3^{10}\)
\(\Rightarrow x:5=10\)
\(\Rightarrow x=10:5=2\)
Vậy...
d, \(2.x-1234+264=786\)
\(2x=786+1234-264\)
\(2x=1756\Rightarrow x=878\)
Vậy...
34.66 - 34.4 - 66.34 - 66.4
= ( 34.66 - 66.34) - ( 34.4 +66.4)
= 0 - 4.(34+66)
= -4.100
= -400
\(34.\left(66-4\right)-66.\left(34+4\right)\\ =34.66-34.4-66.34-66.4\\ =\left(34-34-4\right).66-34.4\\ =-4.66-34.4\\ =4.\left(-66\right)-34.4\\ =4.\left(-66-34\right)\\ =4.\left(-100\right)\\=-400\\ -264.\left(-400\right).264.40\\ =264.400.264.40\\ =264.4.100.264.4.10\\ =264.4.264.4.\left(100.10\right)\\ =\left(264.4\right)^2.1000\\ =1115136.1000=1115136000\)
\(\left(318-x\right)+264=327\\ 318-x+264=327\\ \left(318+264\right)-x=327\\ 582-x=327\\ x=582-327\\ x=255\)
\(126=2\cdot3^2\cdot7\\ 462=2\cdot3\cdot7\cdot11\\ 264=2^3\cdot3\cdot11\\ ƯCLN\left(126,264,462\right)=2\cdot3=6\)
=200 nha bạn
Ai tich mik mik tích cho , mik có nhiều nick lắm.