Tìm x x - 5,82 = 39 x 0,5
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a) \(\dfrac{-12}{17}< \dfrac{x}{17}< \dfrac{-8}{17}\)
\(\Rightarrow-12< x< -8\)
\(\Rightarrow x\in\left\{-11;-10;-9\right\}\)
b) \(\dfrac{-1}{2}< x< \dfrac{5}{3}\)
\(\Rightarrow\dfrac{-3}{6}< x< \dfrac{10}{6}\)
\(\Rightarrow x\in\left\{\dfrac{-2}{6};\dfrac{-1}{6};0;\dfrac{1}{6};...;\dfrac{7}{6};\dfrac{8}{6};\dfrac{9}{6}\right\}\)
c) \(3,456< x\le7,89\)
\(\Rightarrow x\in\left\{3,456;3,457,3,458;...;7,89\right\}\)
d) \(5,82< \overline{5,8x0}< 8,845\)
\(\Rightarrow x\in\left\{3;4\right\}\)
e) \(32,82< \overline{3x,850}< 35,845\)
\(\Rightarrow x\in\left\{3;4\right\}\)
6/20:3=6/20x1/3=6/60=1/10
11h-8h30p=2h30p=2.5h
10 7/10-4 3/10
=107/10-43/10
=64/10=32/5
chúc bn học tốt!
a) 92 : 0,01 = 9200 92 x 100 = 9200 64 : 0,01= 6400
b) 25 : 0,5 = 50 25 x 2 = 50 39 : 0,5 = 78
c) 32 : 0,25 = 128 32 x 4 = 128 15 : 0,25 = 60
x : 0,125 + x : 0,5 + x : 0,25 = x : 0,5 + 165
x : 8 + x : 2 + x : 4 = x : 2 + 165
x : x : 8 + x : 2 + x : 4 = 2 + 165
1 : 8 + x : 2 + x : 4 = 167
8 + x : [ 2 + 4 ] = 167
8 + x : 6 + 167
x : 6 = 167 - 8
x : 6 = 159
x = 159 : 6
x = 26.5
\(\dfrac{6}{13}:\left(0,5+x\right)=\dfrac{15}{39}\)
\(\dfrac{6}{13}:\left(0,5+x\right)=\dfrac{5}{13}\)
\(0,5+x=\dfrac{6}{13}:\dfrac{5}{13}\)
\(0,5+x=\dfrac{6}{13}\cdot\dfrac{13}{5}\)
\(0,5+x=\dfrac{6}{5}\)
\(x=\dfrac{6}{5}-0,5\)
\(x=\dfrac{12}{10}-\dfrac{5}{10}\)
\(x=\dfrac{7}{10}\)
\(\dfrac{6}{13}:\left(0,5+x\right)=\dfrac{15}{39}\\ \Rightarrow\dfrac{6}{13}:\left(\dfrac{1}{2}+x\right)=\dfrac{15}{39}\\ \Rightarrow\dfrac{1}{2}+x=\dfrac{6}{13}:\dfrac{15}{39}\\ \Rightarrow\dfrac{1}{2}+x=\dfrac{6}{13}\times\dfrac{39}{15}\\ \Rightarrow\dfrac{1}{2}+x=\dfrac{6}{5}\\ \Rightarrow x=\dfrac{6}{5}-\dfrac{1}{2}=\dfrac{6\times2-5}{10}=\dfrac{7}{10}\)
x - 5,82 = 19,5
x = 19,5 + 5,82
x = 25,32
x - 5,82 = 19,5
x = 19,5 + 5,82
x = 25,32