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\(x\times2\dfrac{2}{3}=3\dfrac{4}{8}+6\dfrac{5}{12}\)
\(x\times\dfrac{8}{3}=\dfrac{28}{8}+\dfrac{77}{12}\)
\(x\times\dfrac{8}{3}=\dfrac{119}{12}\)
\(x=\dfrac{119}{12}:\dfrac{8}{3}\)
\(x=\dfrac{119}{32}\)
\(x\) x 8/3 = 7/2 + 77/12
\(x\) x 8/3 = 119/12
\(x\) = 119/12 : 8/3
x = 119/32
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Lời giải:
a.
$x-\frac{1}{2}=\frac{2}{3}$
$x=\frac{2}{3}+\frac{1}{2}=\frac{7}{6}$
b.
$x\times \frac{5}{6}=\frac{1}{2}$
$x=\frac{1}{2}: \frac{5}{6}=\frac{3}{5}$
c.
$x:\frac{2}{5}=10$
$x=10\times \frac{2}{5}=4$
d.
$\frac{7}{5}-x=\frac{12}{10}$
$x=\frac{7}{5}-\frac{12}{10}=\frac{1}{5}$
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(x + 2) + (x + 5) +(x + 7) +(x + 12) + (x + 19) + (x + 31) + (x + 50) + (x + 81) + (x + 131) = 347
8x+(2+5+7+12+19+31+50+81+131)=347
8x+338=347
8x=9
Vậy =9/8
chúc bạn học tốt ^-^
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( x - 2) .5 - 3 = 12
( x - 2) . 5 = 12 + 3
( x- 2) . 5 = 15
x - 2 = 15: 5
x - 2 = 3
x = 3 + 2
x = 5
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x : 12 + x . 12 + x : 12 . 5 = 12300
x . 1/12 + x . 12 + x . 5/12 = 12300
x . 1/2 + x . 12 = 12300
x . 25/2 = 12300
x = 12300 : 25/2
x = 984
Vậy x = 984.
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a) \(15-5\left|x+4\right|=-12-3\)
\(\Leftrightarrow5\left|x+4\right|=30\)
\(\Leftrightarrow\left|x+4\right|=6\)
\(\Leftrightarrow\orbr{\begin{cases}x+4=6\\x+4=-6\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=2\\x=-10\end{cases}}\)
b) \(\left(4x-8\right)\left(7-x\right)=0\Leftrightarrow\orbr{\begin{cases}4x-8=0\\7-x=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=2\\x=7\end{cases}}\)
c) \(\left(x^2-36\right)\left(x^2+5\right)=0\Rightarrow\left(x-6\right)\left(x+6\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-6=0\\x+6=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=6\\x=-6\end{cases}}\)
d) \(-3\left(x+7\right)-11=2\left(x+5\right)\)
\(\Leftrightarrow-3x-32=2x+10\)
\(\Leftrightarrow5x=-42\Rightarrow x=-\frac{42}{5}\)
12/x = 2/5
ta có :
12/30 - 2/5
Chúc bạn học giỏi
x là:30