Tim x:
a)0,35 - 0,2x = 4,28
b)\(\left(\frac{-1}{2}\right).\left(\frac{4}{5}+x\right)=1\)
Tim x
\(\left(2x\right):\left(-0,35\right)=\left(-1,4\right):1\frac{1}{3}\)
=> 2x :(-0,35)=-21/20
=> 2x=0,3675
=> x=0,18375
study wel
k nha
mk xin cảm ơn mọi ngời nhiều
\(2x:\left(-0,35\right)=-1,4:1\frac{1}{3}\)
\(\Rightarrow2x:-\frac{7}{20}=-\frac{7}{5}:\frac{4}{3}\)
\(\Rightarrow2x:-\frac{7}{20}=-\frac{21}{20}\)
\(\Rightarrow2x=-\frac{21}{20}.\left(-\frac{7}{20}\right)\)
đến đêy thì gặp vấn đề ^^"
2x : (-0,35) = -1,4 : \(1\frac{1}{3}\)
<=> 2x = \(\frac{147}{400}\)
<=> x = \(\frac{147}{800}\)
\(\left[5\frac{1}{6}-\left(0,6:7\frac{1}{2}+3\frac{2}{5}.0,35\right)\right]:\left(12-2\frac{2}{3}.4\frac{3}{4}\right)\)
Tính nhanh
Giải giùm mk mấy bài nha:
Tìm x:a)\(2\left|\frac{3}{2}x-\frac{1}{4}\right|=\left|-\frac{5}{4}\right|\)
b)\(\left|2+3x\right|=\left|4x-3\right|\)
THẾ NHA!!!Giúp mk chiều nộp mà (,,T^T,,)
a) \(2\left|\frac{3}{2}x-\frac{1}{4}\right|=\left|-\frac{5}{4}\right|\)
\(\Leftrightarrow\orbr{\begin{cases}2\left|\frac{3}{2}x-\frac{1}{4}\right|=\frac{5}{4}\\2\left|\frac{3}{2}x-\frac{1}{4}\right|=-\frac{5}{4}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}\left|\frac{3}{2}x-\frac{1}{4}\right|=\frac{5}{4}:2\\\left|\frac{3}{2}x-\frac{1}{4}\right|=-\frac{5}{4}:2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}\left|\frac{3}{2}x-\frac{1}{4}\right|=\frac{5}{8}\\\left|\frac{3}{2}x-\frac{1}{4}\right|=-\frac{5}{8}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}\frac{3}{2}x-\frac{1}{4}=\frac{5}{8}\\\frac{3}{2}x-\frac{1}{4}=-\frac{5}{8}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}\frac{3}{2}x=\frac{5}{8}+\frac{1}{4}\\\frac{3}{2}x=-\frac{5}{8}+\frac{1}{4}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}\frac{3}{2}x=\frac{7}{8}\\\frac{3}{2}x=-\frac{3}{8}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{7}{8}:\frac{3}{2}\\x=-\frac{3}{8}:\frac{3}{2}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{7}{8}.\frac{2}{3}\\x=-\frac{3}{8}.\frac{2}{3}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{7}{12}\\x=-\frac{1}{4}\end{cases}}\)
Vậy \(x\in\left\{\frac{7}{12};-\frac{1}{4}\right\}\)
Tim x biet
k) \(\left[\left(3,75:\frac{1}{4}+2\frac{2}{5}.125\%\right)-\left(\frac{7}{2}.0,8-1,2:\frac{3}{2}\right)\right]:\left(1\frac{1}{2}+0,75\right)x=64\)
tim x
\(8\left(x+\frac{1}{x}\right)^2+4\left(x^2+\frac{1}{x^2}\right)-4\left(x^2+\frac{1}{x^2}\right)\left(x+\frac{1}{x}\right)^2=\left(x+4\right)^2\)
Nhân hết ra,giải phương trình bậc cao đi
tim x :
\(a.\left|x+5\right|=\frac{1}{7}-\left|\frac{4}{3}-\frac{1}{6}\right|\)|
\(b.\left|x+\frac{2}{3}\right|=\frac{1}{2}-\left[\frac{1}{4}-\frac{2}{3}\right]\)đau [ ] là dấu ngoặc đơn nha!
\(c.\left|x-\frac{1}{5}\right|=\left|\frac{-5}{2}\right|-\left[\frac{1}{4}-\frac{2}{3}\right]\)đau [ ] là dấu ngoặc đơn nha!
\(d.\left|x-\frac{5}{2}\right|=\frac{4}{3}-\left[\frac{2}{3}-\frac{1}{6}\right]\)đau [ ] là dấu ngoặc đơn nha!
ai nhanh nhất mk tk !
cau a dau nhi cuoi cung k phai j dau nha ! mk an lom !
\(a,\)\(\left|x+5\right|=\frac{1}{7}-\left|\frac{4}{3}-\frac{1}{6}\right|\)
\(\Leftrightarrow\left|x+5\right|=\frac{1}{7}-\frac{7}{6}\)
\(\Leftrightarrow\left|x+5\right|=\frac{-43}{42}\)
ta có |x+5| \(\ge\)0 \(\forall x\)
Mà \(-\frac{43}{42}< 0\)nên ko có giá trị x thoả mãn
b,
\(\left|x+\frac{2}{3}\right|=\frac{1}{2}-\left(\frac{1}{4}+\frac{2}{3}\right)\)
\(\Leftrightarrow\left|x+\frac{2}{3}\right|=\frac{11}{12}\)
\(\Leftrightarrow\orbr{\begin{cases}x+\frac{2}{3}=\frac{11}{12}\forall x\ge-\frac{2}{3}\\-x-\frac{2}{3}=\frac{11}{12}\forall< -\frac{2}{3}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{1}{4}\\x=-\frac{19}{12}\end{cases}}\)(thoả mãn đk)
a, \(\left(12-\frac{7}{18}-10\frac{13}{18}\right):x-1\frac{7}{13}=1\frac{2}{3}\)
b,\(\left[\left(6\frac{3}{7}-\frac{0,75x-2}{0,35}\right).2,8+1,75\right]:0,05=235\)
c.\(\frac{3-x}{5-x}=\left(\frac{3}{5}\right)^2\)
d,\(\left(1-\frac{3}{10}-x\right):\left(\frac{19}{10}-1-\frac{2}{5}\right)+\frac{4}{5}=1\)
e,\(\left(12\frac{7}{18}-10\frac{13}{18}\right):x-1\frac{7}{33}:\frac{8}{11}=1\frac{2}{3}\)
các bạn ơi giúp tớ với
tìm x
a) \(1\frac{1}{3}:0,8=\frac{2}{3}:\left(0,2x\right)\)
b)\(-\frac{5}{2}x+\frac{3}{4}=\frac{6}{5}x-\frac{1}{2}\)
M=\(\frac{\left(0,34-\frac{1}{25}\right):\frac{5}{2}}{0,8:\left(\frac{4}{5}-1,25\right)}\) - (1,2 . 0,35):(\(\frac{-4}{5}\) ) . Tính M