3,75 *( 3x : 20 + 32)= 120,45
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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 \(x=\dfrac{1}{27}\)
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5 *x + 3,75 *x + 1,25 *x= 20
<=>x* (5+3,75+1,25) =20
<=>x* 10 =20
<=>x = 20:10
<=>x =2
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3,75 + 418 = 421 , 75
20 + 0,424 = 20,424
* Hok tốt !
# Miu
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Tìm x
\(3,75\left(3x:20+32\right)=120,45\)
\(3x:20+32=120,45:3,75\)
\(3x:20+32=32,12\)
\(3x:20=32,12-32\)
\(3x:20=0,12\)
\(3x=0,12.20\)
\(3x=2,4\)
\(x=2,4:3\)
\(x=0,8\)
Vậy \(x=0,8.\)
(3x:20+32)=120,45:3,75
(3x:20+32)=32,12
3x:20=32,12-32
3x:20=0,12
3x=0,12×20
3x=2,4
x=2,4:3
x=0,8
vậy x=0,8