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a. \(\dfrac{x}{5}=\dfrac{8}{10}\)
\(\Rightarrow10x=8.5\)
\(\Rightarrow10x=40\)
\(\Rightarrow x=\dfrac{40}{10}=4\)
b. \(\dfrac{9}{x}=\dfrac{90}{100}\)
\(\Rightarrow9.100=90x\)
\(\Rightarrow900=90x\)
\(\Rightarrow x=\dfrac{900}{90}=10\)
c. \(17+\dfrac{x}{35}=\dfrac{5}{7}\)
\(\Rightarrow\dfrac{595+x}{35}=\dfrac{25}{35}\)
\(\Rightarrow595+x=25\)
\(\Rightarrow x=25-595=-570\)
d. \(x:\dfrac{5}{27}=\dfrac{2}{9}\)
\(\Rightarrow\dfrac{27x:5}{27}=\dfrac{6}{27}\)
\(\Rightarrow27x:5=6\)
\(\Rightarrow27x=5.6\)
\(\Rightarrow27x=30\)
\(\Rightarrow x=\dfrac{30}{27}=\dfrac{10}{9}\approx1,11\)
\(\dfrac{3}{7}\times x=\dfrac{1}{3}\)
\(x=\dfrac{1}{3}:\dfrac{3}{7}\)
\(x=\dfrac{7}{9}\)
\(x:\dfrac{6}{8}=\dfrac{2}{5}\)
\(x=\dfrac{2}{5}\times\dfrac{6}{8}\)
\(x=\dfrac{6}{20}=\dfrac{3}{10}\)
\(x-\dfrac{2}{3}=\dfrac{5}{6}\)
\(x=\dfrac{5}{6}+\dfrac{2}{3}\)
\(x=\dfrac{9}{6}=\dfrac{3}{2}\)
\(x-\dfrac{2}{5}-\dfrac{4}{35}=\dfrac{1}{7}\)
\(x=\dfrac{1}{7}+\dfrac{4}{35}+\dfrac{2}{5}\)
\(x=\dfrac{23}{35}\)
.
a)136-x=400/8+7
136-x=50+7
136-x=57
x=136-57
x=79
b)x+x+x+15=21
3x=21-15
3x=6
x=6/3
x=2
c)35+x+27=80
62+x=80
x=80-62
x=18
a)136-x=400:8+7
136-x=57
x=136-57
x=79
b)x+x+x+15=21
x*3+15=21
x*3=21-15
x=6:3
x=2
c)35+x+27=80
35+x=80-27
x=53-35
x=18
a) x=24/35 -2/7
x=14/35
b) x=7/8+5/6
x=41/24
c) x-11/5=3/5
x=11/5+3/5
x=14/5
tick cho mình nhé
a, 35 - \(x\) < 35 - 5
35 - \(x\) < 30
\(x\) < 35 - 30
\(x\) < 5
\(x\) = 1; 2; 3; 4; 5
b, \(x\) - 10 < 35 - 10
\(x\) - 10 < 15
\(x\) < 15 + 10
\(x\) < 25
\(x\) = 0; 1; 2; 3; 4; 5; ....;24
c, \(x\) - 10 < 45
\(x\) < 45 + 10
\(x\) < 55
\(x\) = 0; 1; 2; 3; 4;...;54
2006 : \(x\) + 1955 = 2014
2006 : \(x\) = 2014 - 1955
2006 : \(x\) = 59
\(x\) = 2006 : 59
\(x\) = 34
\(x\times35\) - 35 = 1225
\(x\) \(\times\) 35 = 1225 + 35
\(x\times\) 35 = 1260
\(x\) = 1260 : 35
\(x\) = 36
981 \(\times\) ( \(x\) + 189) = 185409
\(x\) + 189 = 185409 : 981
\(x\) + 189 = 189
\(x\) = 189 - 189
\(x\) = 0
2/3 = 2 x 4/ 3 x 4 =8/12
8/14 = 8 : 2/ 14 : 2 =4/7
5/9 = 5 x3/ 9 x 3 =15/37
35/ 40 = 35 : 5/ 40 : 5=7/8
\(a.35\cdot9-35\cdot7\\ =35\cdot\left(9-7\right)\\ =35\cdot2=70\\ b.536\cdot8-536\cdot6\\ =536\cdot\left(8-6\right)\\ =536\cdot2=........\)
a) \(35\times9-35\times7=35\times\left(9-7\right)=35\times2=70\)
b) \(536\times8-536\times6=536\times\left(8-6\right)=536\times2=1072\)
X =5
<=> x/35 +1 =8
<=> x/35 =7
<=> x= 5