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Giúp mình giải bài này nhé , mình đang rất gấp.
Tìm x biết : 1 - ( 5 4/9 + x - 7 7/18 ) : 15 3/7 = 0
=>\(\left(\frac{49}{9}+x-\frac{133}{18}\right):\frac{108}{7}=1\)
=>\(\frac{49}{9}+x-\frac{133}{18}=\frac{108}{7}\)
=>\(\frac{49}{9}+x=\frac{108}{7}+\frac{133}{18}\)
=>\(\frac{49}{9}+x=\frac{2875}{126}\)
=>\(x=\frac{2975}{126}-\frac{49}{9}\)
=>\(x=\frac{2189}{126}\)
2189/162
nhớ đưa 100000000000000000000000000000000000000000000000000000000k ok
bài2 \(x\times\dfrac{15}{16}-x\times\dfrac{4}{16}=2\)
\(x\times\dfrac{11}{16}=2\)
\(x=2:\dfrac{11}{16}\)
\(x=\dfrac{32}{11}\)
Bài 1 :
\(\dfrac{x}{16}\times\left(2017-1\right)=2\)
\(\dfrac{x}{16}\times2016=2\)
\(\dfrac{x}{16}=\dfrac{2}{2016}\)
\(x=\dfrac{2}{2016}\times16\)
\(x=\dfrac{1}{63}\)
a) x - 26 : 13 = 2017
x - 2 = 2017
x = 2017 + 2
x = 2019
b) \(\frac{2}{3}+\frac{1}{3}.\left(x+28\right)=18\)
\(\frac{1}{3}.\left(x+28\right)=18-\frac{2}{3}\)
\(\frac{1}{3}.\left(x+28\right)=\frac{54}{3}-\frac{2}{3}\)
\(\frac{1}{3}.\left(x+28\right)=\frac{52}{3}\)
\(x+28=\frac{52}{3}:\frac{1}{3}\)
\(x+28=52\)
\(x=52-28\)
\(x=24\)
c) \(\frac{7}{8}.\left(x-27\right)=\frac{9}{8}-0,125\)
\(\frac{7}{8}.\left(x-27\right)=1\)
\(x-27=1:\frac{7}{8}\)
\(x-27=\frac{8}{7}\)
\(x=\frac{8}{7}+27\)
\(x=\frac{8}{7}+\frac{189}{7}\)
\(x=\frac{197}{7}\)
a) \(7.x+8.x+9.x+...+100.x=1025\)
\(\left(7+8+9+...+100\right).x=1025\)
\(5029.x=1025\)
\(x=1025\div5029\)
\(x=\frac{1025}{5029}\)
b) \(32.\left(x-3\right)+18.x=2\)
\(32.x-32.3+18.x=2\)
\(\left(32+18\right).x-96=2\)
\(50.x=98\)
\(x=98\div50\)
\(x=1,96\)
Chú ý nè: Dấu "." là dấu nhân đó!
a) 7.x+8.x+9.x+...+100.x=1025
(7+8+9+...+100).x=1025
5029.x=1025
x=1025÷5029
x=\(\frac{1025}{5029}\)
\(\left(3x-18\right)\left(x-9\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}3x-18=0\\x-9=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}3x=18\\x=9\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=6\\x=9\end{cases}}\)
Vậy \(x\in\left\{6;9\right\}\)
(3.x-18).(x-9)=0
=>(3.x-18)=0 hoặc x-9=0
3.x=18 x=9
x=6
vậy x=6 hoặc x=9