0.5*x-2/3*x=5/12
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ính bằng cách thuận tiện nhất:
0.5 x 17 x 5 + 0.25 x 520 + 31 x 2.5
=>2,5x17+2.5x52+2,5x31
=2,5(17+52+31)
=2,5x100
=250
\(0,5\times17\times5\times0,25\times520+31\times2,5\)
\(\Rightarrow2,5\times17+2,5\times52+2,5\times31\)
\(\Rightarrow2,5\times\left(17+52+31\right)\)
\(\Rightarrow2,5\times100\)
\(\Rightarrow2500\)
x : 1 + x : 0,5 + x : 0,25 + x : 0,125 = 60
=> \(x+x:\frac{5}{10}+x:\frac{25}{100}+x:\frac{125}{1000}=60\)
=> \(x+x\cdot\frac{10}{5}+x\cdot\frac{100}{25}+x\cdot\frac{1000}{125}=60\)
=> \(x+x\cdot2+x\cdot4+x\cdot8=60\)
=> x(1 + 2 + 4 + 8) = 60
=> x.15 = 60
=> x = 4
Bài làm
\(x:1+x:0,5+x:0,25+x:0,125=60\)
\(x:1+x:\frac{5}{10}+x:\frac{25}{100}+x:\frac{125}{1000}=60\)
\(x:\left(1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\right)=60\)
\(x:\left(\frac{8}{8}+\frac{4}{8}+\frac{2}{8}+\frac{1}{8}\right)=60\)
\(x:\frac{15}{8}=60\)
\(x=60x\frac{15}{8}\)
\(x=112,5\)
Vậy \(x=112,5\)
`x/2+x+x/3+x+x+x/4=5 3/4`
`=>3x+x/2+x/3+x/4=23/4`
`=>49/12x=23/4`
`=>x=69/49`
Vậy `x=69/49`
\(\Leftrightarrow-\dfrac{2}{5}\left(4x-3\right)^2=-\dfrac{5}{18}\)
\(\Leftrightarrow\left(4x-3\right)^2=\dfrac{25}{36}\)
\(\Leftrightarrow4x-3\in\left\{\dfrac{5}{6};-\dfrac{5}{6}\right\}\)
hay \(x\in\left\{\dfrac{23}{24};\dfrac{13}{24}\right\}\)
a) \(x+215=480\)
\(x=480-215\)
\(x=265\)
b) \(725-x=185:5\)
\(725-x=37\)
\(x=725-37\)
\(x=688\)
c) \(x\times\dfrac{1}{3}+x\times\dfrac{4}{3}=\dfrac{2}{3}\)
\(x\times\left(\dfrac{1}{3}+\dfrac{4}{3}\right)=\dfrac{2}{3}\)
\(x\times\dfrac{5}{3}=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}:\dfrac{5}{3}=\dfrac{2}{3}\times\dfrac{3}{5}\)
\(x=\dfrac{2}{5}\)
d) \(\left(\dfrac{13}{5}+\dfrac{2}{3}\right):x=5\)
\(\dfrac{49}{15}:x=5\)
\(x=\dfrac{49}{15}:5=\dfrac{49}{15}\times\dfrac{1}{5}\)
\(x=\dfrac{49}{75}\)
a)x + 215 = 480
x = 480 - 215
x = 265
b) 725 - x = 185 : 5
725 - x = 37
x = 725 - 37
x = 688
\(\dfrac{3}{5}x-\dfrac{3}{5}+x=5\)
\(\Rightarrow\dfrac{3}{5}x+x-\dfrac{3}{5}=5\)
\(\Rightarrow\dfrac{8}{5}x=5+\dfrac{3}{5}\)
\(\Rightarrow\dfrac{8}{5}x=\dfrac{28}{5}\)
\(\Rightarrow x=\dfrac{28}{5}:\dfrac{8}{5}\)
\(\Rightarrow x=\dfrac{28}{5}.\dfrac{5}{8}\)
\(\Rightarrow x=\dfrac{7}{2}\)
3/5 x ( X - 1 ) + X = 5
(X + 1) + X = 5 - 3/5
X + 1 + X = 22/5
2X + 1 = 22/5
= 2X = 22/5 - 1
2X = 17/5
X = 17/5 : 2
X = 17/10
<=> 1/2 * x - 2/3 * x = 5/12
<=> x *(1/2 - 2/3) = 5/12
<=> x * (-1/6) = 5/12
<=> x = 5/12 : (-1/6)
<=> x = -5/2 (tm)