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\(\left(25\%\cdot x-7,25\right)+4,25=10\)
=>\(x\cdot0,25-3=10\)
=>\(x\cdot0,25=13\)
=>\(x=\dfrac{13}{0,25}=52\)
-5,17 - 0,469 = -5,639
-2,05 + 1,73 = -0,32
(-5,17) x (-3,1) = 16,027
(-9,18) : 4,25 = -2,16
a) -5,17 – 0,469
= (-5,17) + (-0,469)
= -5,639
b) -2,05 + 1,73
= -0,32
c) (-5,17).(-3,1) = 16,027
d) (-9,18) : 4,25 = -2,16
a) Ta có: \(x-\frac{2}{3}=0,75\)
\(\Leftrightarrow x-\frac{2}{3}=\frac{3}{4}\)
hay \(x=\frac{3}{4}+\frac{2}{3}=\frac{17}{12}\)
Vậy: \(x=\frac{17}{12}\)
b) Ta có: \(\frac{1}{3}+\frac{2}{3}x=-1\)
\(\Leftrightarrow\frac{2}{3}x=-1-\frac{1}{3}=-\frac{4}{3}\)
hay \(x=\frac{-4}{3}:\frac{2}{3}=\frac{-4}{3}\cdot\frac{3}{2}=-2\)
Vậy: x=-2
c) Ta có: \(\left|2x-3\right|-\frac{3}{4}=4,25\)
\(\Leftrightarrow\left|2x-3\right|=\frac{17}{4}+\frac{3}{4}=5\)
\(\Leftrightarrow\left[{}\begin{matrix}2x-3=5\\2x-3=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=8\\2x=-2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-1\end{matrix}\right.\)
Vậy: x∈{-1;4}
a, \(x-\frac{2}{3}=0.75\)
\(x=0.75-\frac{2}{3}\)
\(x=\frac{1}{12}\)
Vậy...
b, \(\frac{1}{3}+\frac{2}{3}\cdot x=-1\)
\(\frac{2}{3}\cdot x=-1-\frac{1}{3}=-\frac{4}{3}\)
\(x=-\frac{4}{3}:\frac{2}{3}=-2\)
Vậy x = -2
c, \(|2x-3|-\frac{3}{4}=4.25\)
\(|2x-3|=4.25-\frac{3}{4}=\frac{7}{2}\)
=> \(2x-3=\frac{7}{2}hay2x-3=-\frac{7}{2}\)
2x = \(\frac{7}{2}+3\) 2x = \(-\frac{7}{2}+3\)
2x = \(\frac{13}{2}\) 2x = \(-\frac{1}{2}\)
x = \(\frac{12}{2}:2=\frac{13}{4}\) x = \(-\frac{1}{2}:2\) = \(-\frac{1}{4}\)
Vậy...
\(a,\frac{11}{6}=-\frac{x}{5}\)
\(\Leftrightarrow-x\times6=11\times5\)
\(\Leftrightarrow-6x=55\)
\(\Leftrightarrow x=55:\left(-6\right)\)
\(\Leftrightarrow x=-\frac{55}{6}\)
\(b,4,25:8=-3,5:x\)
\(\Leftrightarrow\frac{17}{32}=--\frac{7}{2}:x\)
\(\Leftrightarrow x=-\frac{7}{2}:\frac{17}{32}\)
\(\Leftrightarrow x=-\frac{112}{17}\)
a) \(\frac{11}{6}=\frac{-x}{5}\)
\(\Rightarrow\frac{55}{30}=\frac{\left(-x\right)\cdot6}{30}\)
\(\Rightarrow55=\left(-x\right)\cdot6\)
\(\Rightarrow-x=\frac{55}{6}\)
\(\Rightarrow x=-\frac{55}{6}\)
b) \(4,25:8=-3,5:x\)
\(\Rightarrow0,53125=-3,5:x\)
\(\Rightarrow x=-3,5:0,53125\)
\(\Rightarrow x=-6,5882...\)
\(\text{4,25×17,23 }=73,2275\)
\(4,25\cdot17,23=73,2275\)