2005 x ( 186 x 32 - 93 x 64 ) =
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a; \(\dfrac{93}{17}\): \(x\) + (- \(\dfrac{21}{17}\)) : \(x\) + \(\dfrac{22}{7}\): \(\dfrac{22}{3}\) = \(\dfrac{5}{14}\)
\(\dfrac{94}{17}\) \(\times\) \(\dfrac{1}{x}\) - \(\dfrac{21}{17}\) \(\times\) \(\dfrac{1}{x}\) + \(\dfrac{3}{7}\) = \(\dfrac{5}{14}\)
\(\dfrac{72}{17}\) \(\times\) \(\dfrac{1}{x}\) + \(\dfrac{3}{7}\) = \(\dfrac{5}{14}\)
\(\dfrac{72}{17x}\) = \(\dfrac{5}{14}\) - \(\dfrac{3}{7}\)
\(\dfrac{72}{17x}\) = - \(\dfrac{1}{14}\)
17\(x\) = 72.(-14)
17\(x\) = - 1008
\(x\) = - 1008 : 17
\(x\) = - \(\dfrac{1008}{17}\)
Vậy \(x\) \(=-\dfrac{1008}{17}\)
b; - \(\dfrac{32}{27}\) - (3\(x\) - \(\dfrac{7}{9}\))3 = - \(\dfrac{24}{27}\)
- \(\dfrac{32}{27}\) + \(\dfrac{24}{27}\) = (3\(x\) - \(\dfrac{7}{9}\))3
(3\(x-\dfrac{7}{9}\))3 = - \(\dfrac{8}{27}\)
(3\(x-\dfrac{7}{9}\))3 = (- \(\dfrac{2}{3}\))3
3\(x-\dfrac{7}{9}\) = - \(\dfrac{2}{3}\)
3\(x\) = - \(\dfrac{2}{3}\) + \(\dfrac{7}{9}\)
3\(x\) = \(\dfrac{1}{9}\)
\(x\) = \(\dfrac{1}{9}\) : 3
\(x\) = \(\dfrac{1}{27}\)
Vậy \(x=\dfrac{1}{27}\)
\(a,C1=744+186\\ =930\\ C2=93\times\left(8+2\right)\\ =93\times10=930\\ b,C1:=324+576\\ =900\\ C2=9\times\left(36+64\right)\\ =9\times100\\ =900\\ c,C1=456-399\\ =57\\ C2=57\times\left(8-7\right)\\ =57\)
\(a)\)\(93\times8+93\times2\)
\(=98\times\left(8+2\right)\)
\(=98\times10\)
\(=980\)
\(b)36\times9+64\times9\)
\(=9\times\left(36+64\right)\)
\(=9\times100\)
\(=900\)
\(c)57\times8+57\times7\)
\(=57\times\left(8-7\right)\)
\(=57\times1\)
\(=57\)
`#3107.101107`
A,
\(2\times32\times12+4\times6\times41+8\times27\times3\\ =24\times32+24\times41+24\times27\\ =24\times\left(32+41+27\right)\\ =24\times100\\ =2400\)
B,
\(\left(2006\times2005^{2016}-2005^{2016}\right)\div2005^{2017}\\ =\left[2005^{2016}\times\left(2006-1\right)\right]\div2005^{2017}\\ =\left(2005^{2016}\times2005\right)\div2005^{2017}\\ =2005^{2017}\div2005^{2017}\\ =1\)
\(8,64\times93+8,64:0,5+8,64:0,25+8,64\)
\(=8,64\times93+8,64\times2+8,64\times4+8,64\times1\)
\(=8,64\times\left(92+4+2+1\right)\)
\(=8,64\times100\)
\(=864\)
a) \(x+\left(-10\right)-\left[87+\left(-41\right)+\left(-20\right)-x\right]\)
\(=x-10-\left(87-41-20-x\right)=x-10-87+41+20+x\)
\(=\left(x-x\right)+\left(20-10\right)-\left(87-41\right)=10-46=-36\)
b) \(a+\left(250-186\right)-\left(270-186\right)=a+250-186-270+186\)
\(=a+\left(250-270\right)+\left(186-186\right)=a-20\)
c) \(b-\left(393+170\right)+\left(93+170\right)=b-393-170+93+170\)
\(=b+\left(170-170\right)-\left(393-93\right)=b-300\)
d) \(-\left(a-b+c\right)-\left(a+b+c\right)=-a+b-c-a-b-c=-2a-2c\)
a, 64 x 7 + 81 x 93 + 17 x 7
= 7 x ( 64 + 17 ) + 81 x 93
= 7 x 81 + 81 x 93
= 81 x ( 93 + 7 )
= 81 x 100
= 8100
a) 64 x 7 + 81 x 93 + 17 x 7
= 7 x ( 64 + 17 ) + 81 x 93
= 7 x 81 + 81 x 93
= 81 x ( 7 + 93 )
= 81 x 100
= 8100
64 x X + X + 32 x X + X x 3 = 805
(64+1+32+3) x X = 805
100 x X = 805
X = 805: 100
X = 8,05
2008 x 68 + 32 x 2008
= 2008 x (68 +32)
= 2008x100= 200800
64 x X + X + 32 x X + X x 3 = 805
X x ( 64 + 1 + 32 + 3 ) = 805
X x ( 65 + 35 ) = 805
X x 100 = 805
X = 805 : 100
X = 8,05
2008 x 68 + 32 x 2008
= 2008 x ( 68 + 32 )
= 2008 x 100
= 200800