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c) pt <=> \(x-\frac{21}{5}=\frac{23}{7}< =>x=\frac{23}{7}+\frac{21}{5}=\frac{262}{35}\)
vậy x = \(\frac{262}{35}\)
d) \(x-\frac{3}{4}=\frac{51}{8}< =>x=\frac{51}{8}+\frac{3}{4}=\frac{57}{8}\)
vậy x = \(\frac{57}{8}\)
e) pt <=> \(\frac{7}{8}:x=\frac{7}{2}< =>\frac{7}{8}.\frac{1}{x}=\frac{7}{2}< =>\frac{7}{8x}=\frac{7}{2}< =>56x=14< =>x=\frac{14}{56}=\frac{1}{4}\)
vậy x = \(\frac{1}{4}\)
a) pt <=> \(x+\frac{11}{4}=\frac{17}{3}< =>x=\frac{17}{3}-\frac{11}{4}=\frac{35}{12}\)
vậy x = \(\frac{35}{12}\)
b) pt <=> \(\frac{x.7}{2}=\frac{19}{4}< =>x=\frac{19.2}{4.7}=\frac{38}{28}=\frac{19}{14}\)
vậy x = \(\frac{19}{14}\)
\(\left(x+5\right).\left(x+37:34-32.3-451\right)=0\)
\(\Rightarrow x+5=0\) hoặc \(x+37:34-32.3-451=0\)
TH1:\(x+5=0\)
\(x=0-5\)
\(x=-5\)
TH2:\(x+37:34-32.3-451=0\)
\(x+37:34-32.3=451\)
\(x+37:34-96=451\)
\(x+37:34=451+96\)
\(x+37:34=547\)
\(x+\frac{37}{34}=547\)
\(x=547-\frac{37}{34}\)
\(x=\frac{18561}{34}\)
Vậy \(x=-5\) hoặc \(x=\frac{18561}{34}\)
Số to thế kia chắc mk lm sai hoặc đề sai mk cx lâu ko hk cái này nên quên
vì (x+5).(x+37:34-32.3-451)=0 nên 1 trong 2 kết quả là 0.
vì (x+5) sẽ lớn hơn 0 nên giá trị này không được,vậy chỉ còn giá trị còn lại đó là(x+37:34-32.3-451)
vì (x+37:34-32.3-451) nên (x+37:34-32.3) sẽ bằng 451.
32.3=96
37:34=1,0882352
(x + 1,0882352)=451 + 96=547
x=547-1,882352=545,11765
\(\frac{4}{7}\times x=\frac{1}{5}+\frac{2}{3}\)
\(\frac{4}{7}x=\frac{13}{15}\)
\(\Rightarrow x=\frac{91}{60}\)
các bài còn lại tương tự nha
mấy cái này dễ mà toán tìm x này là cơ bản!!
67865785685685785785774677567568568
a) (x + 1/2) . (2/3 − 2x) = 0
\(\Rightarrow\left[\begin{array}{nghiempt}x+\frac{1}{2}=0\\\frac{2}{3}-2x=0\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=-\frac{1}{2}\\2x=\frac{2}{3}\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=-\frac{1}{2}\\x=\frac{1}{3}\end{array}\right.\)
b) \(\left(x.6\frac{2}{7}+\frac{3}{7}\right).2\frac{1}{5}-\frac{3}{7}=-2\)
\(\Rightarrow\left(x.\frac{44}{7}+\frac{3}{7}\right).\frac{11}{5}=-2+\frac{3}{7}\)
\(\Rightarrow\left(x.\frac{44}{7}+\frac{3}{7}\right).\frac{11}{5}=-\frac{11}{7}\)
\(\Rightarrow x.\frac{44}{7}+\frac{3}{7}=-\frac{11}{7}:\frac{11}{5}=-\frac{11}{7}.\frac{5}{11}\)
\(\Rightarrow x.\frac{44}{7}+\frac{3}{7}=-\frac{5}{7}\)
\(\Rightarrow x.\frac{44}{7}=-\frac{5}{7}-\frac{3}{7}\)
\(\Rightarrow x.\frac{44}{7}=-\frac{8}{7}\)
\(\Rightarrow x=-\frac{8}{7}:\frac{44}{7}=-\frac{8}{7}.\frac{7}{44}\)
\(\Rightarrow x=-\frac{2}{11}\)
c) \(x.3\frac{1}{4}+\left(-\frac{7}{6}\right).x-1\frac{2}{3}=\frac{5}{12}\)
\(\Rightarrow x\left(3\frac{1}{4}-\frac{7}{6}\right)=\frac{5}{12}+\frac{5}{3}\)
\(\Rightarrow x\left(\frac{13}{4}-\frac{7}{6}\right)=\frac{25}{12}\)
\(\Rightarrow x.\frac{25}{12}=\frac{25}{12}\)
\(\Rightarrow x=\frac{25}{12}:\frac{25}{12}\)
\(\Rightarrow x=1\)
d) \(5\frac{8}{17}:x+\left(-\frac{4}{17}\right):x+3\frac{1}{7}:17\frac{1}{3}=\frac{4}{11}\)
\(\Rightarrow\left(5\frac{8}{17}-\frac{4}{17}\right):x+\frac{22}{7}:\frac{52}{3}=\frac{4}{11}\)
\(\Rightarrow5\frac{4}{17}:x+\frac{33}{182}=\frac{4}{11}\)
\(\Rightarrow\frac{89}{17}:x=\frac{4}{11}-\frac{33}{182}\)
\(\Rightarrow\frac{89}{17}:x=\frac{365}{2002}\)
\(\Rightarrow x=\frac{89}{17}:\frac{365}{2002}\)
\(\Rightarrow x\approx28,7\) (số hơi lẻ)
e) \(\frac{17}{2}-\left|2x-\frac{3}{4}\right|=-\frac{7}{4}\)
\(\Rightarrow\left|2x-\frac{3}{4}\right|=\frac{17}{2}+\frac{7}{4}\)
\(\Rightarrow\left|2x-\frac{3}{4}\right|=\frac{41}{4}\)
\(\Rightarrow\left[\begin{array}{nghiempt}2x-\frac{3}{4}=\frac{41}{4}\\2x-\frac{3}{4}=-\frac{41}{4}\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}2x=11\\2x=-\frac{19}{2}\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{11}{2}\\x=-\frac{19}{4}\end{array}\right.\)
a) \(|x+1|=3\)
\(\Rightarrow x+1=\pm3\)
+) \(x+1=3\) +) \(x+1=-3\)
\(\Rightarrow x=2\) \(\Rightarrow x=-4\)
Vậy \(x\in\left\{2;-4\right\}\)
b) \(3^2x+2^4=5^2\)
\(9x+16=25\)
\(9x=25-16\)
\(9x=9\)
\(x=1\)
c) \(\frac{4+x}{7+y}=\frac{4}{7}\)
\(\Rightarrow\left(4+x\right).7=\left(7+y\right).4\)
\(\Rightarrow28+7x=28+4y\)
\(\Rightarrow7x=4y\)
Mà \(\left(7,4\right)=1\) và \(x+y=11\)
Vậy \(x=4;y=7\)
a) Ta có: \(\left|x+1\right|=3\)
\(\Rightarrow x+1=\pm3\)
Nếu x + 1 = 3 => x = 2
Nếu x + 1 = -3 => x = -4
Vậy x = {2;-4}
b) \(3^2x+2^4=5^2\)
\(\Rightarrow9x+16=25\)
\(\Rightarrow9x=9\)
\(\Rightarrow x=1\)
Vậy x = 1
c) \(\frac{4+x}{7+x}=\frac{4}{7}\)
\(\Rightarrow7\left(4+x\right)=4\left(7+x\right)\)
\(\Rightarrow28+7x=28+4x\)
\(\Rightarrow7x-4x=0\)
\(\Rightarrow x=0\)
Vậy x = 0
